diff --git a/mozilla/xpcom/tests/TestMinStringAPI.cpp b/mozilla/xpcom/tests/TestMinStringAPI.cpp
index be2289ee318..301c51e5207 100644
--- a/mozilla/xpcom/tests/TestMinStringAPI.cpp
+++ b/mozilla/xpcom/tests/TestMinStringAPI.cpp
@@ -35,6 +35,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#include <stdio.h>
 #include "nsStringAPI.h"
 #include "nsCRT.h"