diff --git a/src/kits/support/Locker.cpp b/src/kits/support/Locker.cpp
index e619d6e0fb..02a1bd83b5 100644
--- a/src/kits/support/Locker.cpp
+++ b/src/kits/support/Locker.cpp
@@ -14,6 +14,8 @@
 #include <Locker.h>
 #include <SupportDefs.h>
 
+#include <stdio.h>
+
 #include "support_kit_config.h"