diff --git a/lib/private/Config.php b/lib/private/Config.php
index 0e3a9b22a7710..f10393ce871b9 100644
--- a/lib/private/Config.php
+++ b/lib/private/Config.php
@@ -59,6 +59,8 @@ class Config {
 	protected $configFileName;
 	/** @var bool */
 	protected $isReadOnly;
+	/** @var int */
+	protected $lastChecksum;
 
 	/**
 	 * @param string $configDir Path to the config dir, needs to end with '/'
@@ -258,10 +260,23 @@ private function writeData() {
 			throw new HintException(sprintf('Configuration was not read or initialized correctly, not overwriting %s', $this->configFilePath));
 		}
 
+		// This creates a checksum of the config file in memory.
+		// The config file opcache code is only invalidated if the
+		// config file data has been changed therefore all the other
+		// code that depend on the the config file opcode will not
+		// be recompiled.
+		$data = var_export($this->cache, true);
+		$currentChecksum = crc32($data);
+
+		if ($this->getLastChecksum() == $currentChecksum)
+			return;
+
+		$this->lastChecksum = $currentChecksum;
+
 		// Create a php file ...
 		$content = "<?php\n";
 		$content .= '$CONFIG = ';
-		$content .= var_export($this->cache, true);
+		$content .= $data;
 		$content .= ";\n";
 
 		touch($this->configFilePath);
@@ -304,4 +319,16 @@ private function checkReadOnly(): void {
 				'Unset "config_is_read_only" to allow changes to the config file.');
 		}
 	}
+
+	private function getLastChecksum(): int {
+		if ($this->lastChecksum == null) {
+			if (file_exists($this->configFilePath)) {
+				$data = file_get_contents($this->configFilePath);
+				$this->lastChecksum = crc32($data);
+			} else {
+				$this->lastChecksum = 0;
+			}
+		}
+		return $this->lastChecksum;
+	}
 }