diff --git a/runtime/base/mutex-inl.h b/runtime/base/mutex-inl.h
index a727992..87840e7 100644
--- a/runtime/base/mutex-inl.h
+++ b/runtime/base/mutex-inl.h
@@ -25,6 +25,7 @@
 #include "base/value_object.h"
 #include "runtime.h"
 #include "thread.h"
+#include "utils.h"
 
 #if ART_USE_FUTEXES
 #include "linux/futex.h"