diff --git a/mlir/include/mlir/Support/ADTExtras.h b/mlir/include/mlir/Support/ADTExtras.h
index 1e4708f8f7d3f..51ec7ac25dbb5 100644
--- a/mlir/include/mlir/Support/ADTExtras.h
+++ b/mlir/include/mlir/Support/ADTExtras.h
@@ -9,6 +9,7 @@
 #ifndef MLIR_SUPPORT_ADTEXTRAS_H
 #define MLIR_SUPPORT_ADTEXTRAS_H
 
+#include "mlir/Support/LLVM.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"