diff --git a/lib/config.php b/lib/config.php
index e204de0baee..19d58c90443 100644
--- a/lib/config.php
+++ b/lib/config.php
@@ -166,6 +166,6 @@ class Config {
 		}
 		// Prevent others from reading the config
 		@chmod($this->configFilename, 0640);
-		OC_Util::clearOpcodeCache();
+		\OC_Util::clearOpcodeCache();
 	}
 }