diff --git a/gfx/tests/TestColorNames.cpp b/gfx/tests/TestColorNames.cpp
index 84c4be1673d..e7ca86ad37b 100644
--- a/gfx/tests/TestColorNames.cpp
+++ b/gfx/tests/TestColorNames.cpp
@@ -40,6 +40,7 @@
 #include <stdio.h>
 #include <string.h>
 #include "nsColor.h"
+#include "nsColorNames.h"
 #include "prprf.h"
 #include "nsString.h"