diff --git a/mozilla/gfx/tests/TestColorNames.cpp b/mozilla/gfx/tests/TestColorNames.cpp
index e332c726e2e..70d5b064d93 100644
--- a/mozilla/gfx/tests/TestColorNames.cpp
+++ b/mozilla/gfx/tests/TestColorNames.cpp
@@ -17,6 +17,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include "nsColorNames.h"
 #include "prprf.h"