diff --git a/src/well_known_classes.h b/src/well_known_classes.h
index fd8f19b..f2c479c 100644
--- a/src/well_known_classes.h
+++ b/src/well_known_classes.h
@@ -17,8 +17,8 @@
 #ifndef ART_SRC_WELL_KNOWN_CLASSES_H_
 #define ART_SRC_WELL_KNOWN_CLASSES_H_
 
+#include "base/mutex.h"
 #include "jni.h"
-#include "mutex.h"
 
 namespace art {