diff --git a/source/common/http/conn_manager_config.h b/source/common/http/conn_manager_config.h
index 6fa836a60692..b32d8f520e40 100644
--- a/source/common/http/conn_manager_config.h
+++ b/source/common/http/conn_manager_config.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "envoy/config/config_provider.h"
+#include "envoy/config/filter/network/http_connection_manager/v2/http_connection_manager.pb.h"
 #include "envoy/http/filter.h"
 #include "envoy/router/rds.h"
 #include "envoy/stats/scope.h"
@@ -170,7 +171,8 @@ class DefaultInternalAddressConfig : public Http::InternalAddressConfig {
  */
 class ConnectionManagerConfig {
 public:
-  enum class HeaderTransformation { OVERWRITE, APPEND_IF_ABSENT, PASS_THROUGH };
+  using HttpConnectionManagerProto =
+      envoy::config::filter::network::http_connection_manager::v2::HttpConnectionManager;
 
   virtual ~ConnectionManagerConfig() = default;
 
@@ -268,9 +270,9 @@ class ConnectionManagerConfig {
   virtual const std::string& serverName() PURE;
 
   /**
-   * @return HeaderTransformation the transformation to apply to Server response headers.
+   * @return ServerHeaderTransformation the transformation to apply to Server response headers.
    */
-  virtual HeaderTransformation serverHeaderTransformation() PURE;
+  virtual HttpConnectionManagerProto::ServerHeaderTransformation serverHeaderTransformation() PURE;
 
   /**
    * @return ConnectionManagerStats& the stats to write to.
diff --git a/source/common/http/conn_manager_impl.cc b/source/common/http/conn_manager_impl.cc
index 119a7ed232ec..c830114f5107 100644
--- a/source/common/http/conn_manager_impl.cc
+++ b/source/common/http/conn_manager_impl.cc
@@ -1354,8 +1354,8 @@ void ConnectionManagerImpl::ActiveStream::encodeHeaders(ActiveStreamEncoderFilte
   connection_manager_.config_.dateProvider().setDateHeader(headers);
   // Following setReference() is safe because serverName() is constant for the life of the listener.
   const auto transformation = connection_manager_.config_.serverHeaderTransformation();
-  if (transformation == ConnectionManagerConfig::HeaderTransformation::OVERWRITE ||
-      (transformation == ConnectionManagerConfig::HeaderTransformation::APPEND_IF_ABSENT &&
+  if (transformation == ConnectionManagerConfig::HttpConnectionManagerProto::OVERWRITE ||
+      (transformation == ConnectionManagerConfig::HttpConnectionManagerProto::APPEND_IF_ABSENT &&
        headers.Server() == nullptr)) {
     headers.insertServer().value().setReference(connection_manager_.config_.serverName());
   }
diff --git a/source/extensions/filters/network/http_connection_manager/BUILD b/source/extensions/filters/network/http_connection_manager/BUILD
index 1f5474a651e2..fbe72b257b15 100644
--- a/source/extensions/filters/network/http_connection_manager/BUILD
+++ b/source/extensions/filters/network/http_connection_manager/BUILD
@@ -40,5 +40,6 @@ envoy_cc_library(
         "//source/common/router:scoped_rds_lib",
         "//source/extensions/filters/network:well_known_names",
         "//source/extensions/filters/network/common:factory_base_lib",
+        "@envoy_api//envoy/config/filter/network/http_connection_manager/v2:http_connection_manager_cc",
     ],
 )
diff --git a/source/extensions/filters/network/http_connection_manager/config.cc b/source/extensions/filters/network/http_connection_manager/config.cc
index e619d537b93d..81a45e934761 100644
--- a/source/extensions/filters/network/http_connection_manager/config.cc
+++ b/source/extensions/filters/network/http_connection_manager/config.cc
@@ -286,22 +286,7 @@ HttpConnectionManagerConfig::HttpConnectionManagerConfig(
     access_logs_.push_back(current_access_log);
   }
 
-  switch (config.server_header_transformation()) {
-  case envoy::config::filter::network::http_connection_manager::v2::HttpConnectionManager::
-      OVERWRITE:
-    server_transformation_ = HeaderTransformation::OVERWRITE;
-    break;
-  case envoy::config::filter::network::http_connection_manager::v2::HttpConnectionManager::
-      APPEND_IF_ABSENT:
-    server_transformation_ = HeaderTransformation::APPEND_IF_ABSENT;
-    break;
-  case envoy::config::filter::network::http_connection_manager::v2::HttpConnectionManager::
-      PASS_THROUGH:
-    server_transformation_ = HeaderTransformation::PASS_THROUGH;
-    break;
-  default:
-    NOT_REACHED_GCOVR_EXCL_LINE;
-  }
+  server_transformation_ = config.server_header_transformation();
 
   if (!config.server_name().empty()) {
     server_name_ = config.server_name();
diff --git a/source/extensions/filters/network/http_connection_manager/config.h b/source/extensions/filters/network/http_connection_manager/config.h
index a31fc3f8f9ed..0385762236c1 100644
--- a/source/extensions/filters/network/http_connection_manager/config.h
+++ b/source/extensions/filters/network/http_connection_manager/config.h
@@ -116,7 +116,9 @@ class HttpConnectionManagerConfig : Logger::Loggable<Logger::Id::config>,
     return scoped_routes_config_provider_.get();
   }
   const std::string& serverName() override { return server_name_; }
-  HeaderTransformation serverHeaderTransformation() override { return server_transformation_; }
+  HttpConnectionManagerProto::ServerHeaderTransformation serverHeaderTransformation() override {
+    return server_transformation_;
+  }
   Http::ConnectionManagerStats& stats() override { return stats_; }
   Http::ConnectionManagerTracingStats& tracingStats() override { return tracing_stats_; }
   bool useRemoteAddress() override { return use_remote_address_; }
@@ -167,7 +169,8 @@ class HttpConnectionManagerConfig : Logger::Loggable<Logger::Id::config>,
   CodecType codec_type_;
   const Http::Http2Settings http2_settings_;
   const Http::Http1Settings http1_settings_;
-  HeaderTransformation server_transformation_{HeaderTransformation::OVERWRITE};
+  HttpConnectionManagerProto::ServerHeaderTransformation server_transformation_{
+      HttpConnectionManagerProto::OVERWRITE};
   std::string server_name_;
   Http::TracingConnectionManagerConfigPtr tracing_config_;
   absl::optional<std::string> user_agent_;
diff --git a/source/server/http/admin.h b/source/server/http/admin.h
index 19f8ac55cf0d..f54d72fee7ff 100644
--- a/source/server/http/admin.h
+++ b/source/server/http/admin.h
@@ -121,8 +121,8 @@ class AdminImpl : public Admin,
     return &scoped_route_config_provider_;
   }
   const std::string& serverName() override { return Http::DefaultServerString::get(); }
-  HeaderTransformation serverHeaderTransformation() override {
-    return HeaderTransformation::OVERWRITE;
+  HttpConnectionManagerProto::ServerHeaderTransformation serverHeaderTransformation() override {
+    return HttpConnectionManagerProto::OVERWRITE;
   }
   Http::ConnectionManagerStats& stats() override { return stats_; }
   Http::ConnectionManagerTracingStats& tracingStats() override { return tracing_stats_; }
diff --git a/test/common/http/conn_manager_impl_fuzz_test.cc b/test/common/http/conn_manager_impl_fuzz_test.cc
index 7a51ab6fda76..df9a0c2b4b35 100644
--- a/test/common/http/conn_manager_impl_fuzz_test.cc
+++ b/test/common/http/conn_manager_impl_fuzz_test.cc
@@ -91,7 +91,9 @@ class FuzzConfig : public ConnectionManagerConfig {
     return &scoped_route_config_provider_;
   }
   const std::string& serverName() override { return server_name_; }
-  HeaderTransformation serverHeaderTransformation() override { return server_transformation_; }
+  HttpConnectionManagerProto::ServerHeaderTransformation serverHeaderTransformation() override {
+    return server_transformation_;
+  }
   ConnectionManagerStats& stats() override { return stats_; }
   ConnectionManagerTracingStats& tracingStats() override { return tracing_stats_; }
   bool useRemoteAddress() override { return use_remote_address_; }
@@ -125,7 +127,8 @@ class FuzzConfig : public ConnectionManagerConfig {
   ConnectionManagerImplHelper::RouteConfigProvider route_config_provider_;
   ConnectionManagerImplHelper::ScopedRouteConfigProvider scoped_route_config_provider_;
   std::string server_name_;
-  HeaderTransformation server_transformation_{HeaderTransformation::OVERWRITE};
+  HttpConnectionManagerProto::ServerHeaderTransformation server_transformation_{
+      HttpConnectionManagerProto::OVERWRITE};
   Stats::IsolatedStoreImpl fake_stats_;
   ConnectionManagerStats stats_;
   ConnectionManagerTracingStats tracing_stats_;
diff --git a/test/common/http/conn_manager_impl_test.cc b/test/common/http/conn_manager_impl_test.cc
index ab8133118b61..496b2af6c7ea 100644
--- a/test/common/http/conn_manager_impl_test.cc
+++ b/test/common/http/conn_manager_impl_test.cc
@@ -276,7 +276,9 @@ class HttpConnectionManagerImplTest : public testing::Test, public ConnectionMan
     return &scoped_route_config_provider_;
   }
   const std::string& serverName() override { return server_name_; }
-  HeaderTransformation serverHeaderTransformation() override { return server_transformation_; }
+  HttpConnectionManagerProto::ServerHeaderTransformation serverHeaderTransformation() override {
+    return server_transformation_;
+  }
   ConnectionManagerStats& stats() override { return stats_; }
   ConnectionManagerTracingStats& tracingStats() override { return tracing_stats_; }
   bool useRemoteAddress() override { return use_remote_address_; }
@@ -317,7 +319,8 @@ class HttpConnectionManagerImplTest : public testing::Test, public ConnectionMan
   NiceMock<Network::MockDrainDecision> drain_close_;
   std::unique_ptr<ConnectionManagerImpl> conn_manager_;
   std::string server_name_;
-  HeaderTransformation server_transformation_{HeaderTransformation::OVERWRITE};
+  HttpConnectionManagerProto::ServerHeaderTransformation server_transformation_{
+      HttpConnectionManagerProto::OVERWRITE};
   Network::Address::Ipv4Instance local_address_{"127.0.0.1"};
   bool use_remote_address_{true};
   Http::DefaultInternalAddressConfig internal_address_config_;
@@ -567,7 +570,7 @@ TEST_F(HttpConnectionManagerImplTest, ServerHeaderOverwritten) {
 
 // When configured APPEND_IF_ABSENT if the server header is present it will be retained.
 TEST_F(HttpConnectionManagerImplTest, ServerHeaderAppendPresent) {
-  server_transformation_ = HeaderTransformation::APPEND_IF_ABSENT;
+  server_transformation_ = HttpConnectionManagerProto::APPEND_IF_ABSENT;
   setup(false, "custom-value", false);
   setUpEncoderAndDecoder(false, false);
 
@@ -579,7 +582,7 @@ TEST_F(HttpConnectionManagerImplTest, ServerHeaderAppendPresent) {
 
 // When configured APPEND_IF_ABSENT if the server header is absent the server name will be set.
 TEST_F(HttpConnectionManagerImplTest, ServerHeaderAppendAbsent) {
-  server_transformation_ = HeaderTransformation::APPEND_IF_ABSENT;
+  server_transformation_ = HttpConnectionManagerProto::APPEND_IF_ABSENT;
   setup(false, "custom-value", false);
   setUpEncoderAndDecoder(false, false);
 
@@ -591,7 +594,7 @@ TEST_F(HttpConnectionManagerImplTest, ServerHeaderAppendAbsent) {
 
 // When configured PASS_THROUGH, the server name will pass through.
 TEST_F(HttpConnectionManagerImplTest, ServerHeaderPassthroughPresent) {
-  server_transformation_ = HeaderTransformation::PASS_THROUGH;
+  server_transformation_ = HttpConnectionManagerProto::PASS_THROUGH;
   setup(false, "custom-value", false);
   setUpEncoderAndDecoder(false, false);
 
@@ -603,7 +606,7 @@ TEST_F(HttpConnectionManagerImplTest, ServerHeaderPassthroughPresent) {
 
 // When configured PASS_THROUGH, the server header will not be added if absent.
 TEST_F(HttpConnectionManagerImplTest, ServerHeaderPassthroughAbsent) {
-  server_transformation_ = HeaderTransformation::PASS_THROUGH;
+  server_transformation_ = HttpConnectionManagerProto::PASS_THROUGH;
   setup(false, "custom-value", false);
   setUpEncoderAndDecoder(false, false);
 
diff --git a/test/common/http/conn_manager_utility_test.cc b/test/common/http/conn_manager_utility_test.cc
index 6db9692a082b..b0c8e005124f 100644
--- a/test/common/http/conn_manager_utility_test.cc
+++ b/test/common/http/conn_manager_utility_test.cc
@@ -64,7 +64,8 @@ class MockConnectionManagerConfig : public ConnectionManagerConfig {
   MOCK_METHOD0(routeConfigProvider, Router::RouteConfigProvider*());
   MOCK_METHOD0(scopedRouteConfigProvider, Config::ConfigProvider*());
   MOCK_METHOD0(serverName, const std::string&());
-  MOCK_METHOD0(serverHeaderTransformation, HeaderTransformation());
+  MOCK_METHOD0(serverHeaderTransformation,
+               HttpConnectionManagerProto::ServerHeaderTransformation());
   MOCK_METHOD0(stats, ConnectionManagerStats&());
   MOCK_METHOD0(tracingStats, ConnectionManagerTracingStats&());
   MOCK_METHOD0(useRemoteAddress, bool());
diff --git a/test/extensions/filters/network/http_connection_manager/config_test.cc b/test/extensions/filters/network/http_connection_manager/config_test.cc
index 8f0207ac91bd..0b048d28e3dc 100644
--- a/test/extensions/filters/network/http_connection_manager/config_test.cc
+++ b/test/extensions/filters/network/http_connection_manager/config_test.cc
@@ -237,7 +237,7 @@ stat_prefix: router
               ContainerEq(config.tracingConfig()->request_headers_for_tags_));
   EXPECT_EQ(*context_.local_info_.address_, config.localAddress());
   EXPECT_EQ("foo", config.serverName());
-  EXPECT_EQ(HttpConnectionManagerConfig::HeaderTransformation::OVERWRITE,
+  EXPECT_EQ(HttpConnectionManagerConfig::HttpConnectionManagerProto::OVERWRITE,
             config.serverHeaderTransformation());
   EXPECT_EQ(5 * 60 * 1000, config.streamIdleTimeout().count());
 }
@@ -406,7 +406,7 @@ TEST_F(HttpConnectionManagerConfigTest, ServerOverwrite) {
   HttpConnectionManagerConfig config(parseHttpConnectionManagerFromV2Yaml(yaml_string), context_,
                                      date_provider_, route_config_provider_manager_,
                                      scoped_routes_config_provider_manager_);
-  EXPECT_EQ(HttpConnectionManagerConfig::HeaderTransformation::OVERWRITE,
+  EXPECT_EQ(HttpConnectionManagerConfig::HttpConnectionManagerProto::OVERWRITE,
             config.serverHeaderTransformation());
 }
 
@@ -426,7 +426,7 @@ TEST_F(HttpConnectionManagerConfigTest, ServerAppendIfAbsent) {
   HttpConnectionManagerConfig config(parseHttpConnectionManagerFromV2Yaml(yaml_string), context_,
                                      date_provider_, route_config_provider_manager_,
                                      scoped_routes_config_provider_manager_);
-  EXPECT_EQ(HttpConnectionManagerConfig::HeaderTransformation::APPEND_IF_ABSENT,
+  EXPECT_EQ(HttpConnectionManagerConfig::HttpConnectionManagerProto::APPEND_IF_ABSENT,
             config.serverHeaderTransformation());
 }
 
@@ -446,7 +446,7 @@ TEST_F(HttpConnectionManagerConfigTest, ServerPassThrough) {
   HttpConnectionManagerConfig config(parseHttpConnectionManagerFromV2Yaml(yaml_string), context_,
                                      date_provider_, route_config_provider_manager_,
                                      scoped_routes_config_provider_manager_);
-  EXPECT_EQ(HttpConnectionManagerConfig::HeaderTransformation::PASS_THROUGH,
+  EXPECT_EQ(HttpConnectionManagerConfig::HttpConnectionManagerProto::PASS_THROUGH,
             config.serverHeaderTransformation());
 }
 
diff --git a/test/server/http/admin_test.cc b/test/server/http/admin_test.cc
index 2c8f5b3ce026..38b87e72fb7b 100644
--- a/test/server/http/admin_test.cc
+++ b/test/server/http/admin_test.cc
@@ -97,7 +97,7 @@ TEST_P(AdminFilterTest, MiscFunctions) {
   EXPECT_EQ(false,
             admin_.createUpgradeFilterChain("", nullptr, mock_filter_chain_factory_callbacks));
   EXPECT_TRUE(nullptr != admin_.scopedRouteConfigProvider());
-  EXPECT_EQ(Http::ConnectionManagerConfig::HeaderTransformation::OVERWRITE,
+  EXPECT_EQ(Http::ConnectionManagerConfig::HttpConnectionManagerProto::OVERWRITE,
             admin_.serverHeaderTransformation());
 }