diff --git a/runtime/throw_location.h b/runtime/throw_location.h
index f30aa4e..c171b07 100644
--- a/runtime/throw_location.h
+++ b/runtime/throw_location.h
@@ -19,6 +19,7 @@
 
 #include "object_callbacks.h"
 #include "base/macros.h"
+#include "base/mutex.h"
 
 #include <stdint.h>
 #include <string>