diff --git a/mozilla/embedding/browser/gtk/tests/TestGtkEmbedNotebook.cpp b/mozilla/embedding/browser/gtk/tests/TestGtkEmbedNotebook.cpp
index 9c03a7894ec..8f08bd55a41 100644
--- a/mozilla/embedding/browser/gtk/tests/TestGtkEmbedNotebook.cpp
+++ b/mozilla/embedding/browser/gtk/tests/TestGtkEmbedNotebook.cpp
@@ -1,5 +1,6 @@
 #include <gtk/gtk.h>
 #include <gtkmozembed.h>
+#include <stdio.h>
 #include "nsStringAPI.h"
 #include "gtkmozembed_glue.cpp"