diff --git a/layout/base/nsCSSRenderingBorders.h b/layout/base/nsCSSRenderingBorders.h
index 46035c24f7c..dd3544f83bc 100644
--- a/layout/base/nsCSSRenderingBorders.h
+++ b/layout/base/nsCSSRenderingBorders.h
@@ -8,6 +8,7 @@
 #define NS_CSS_RENDERING_BORDERS_H
 
 #include "gfxRect.h"
+#include "mozilla/gfx/2D.h"
 #include "mozilla/RefPtr.h"
 #include "nsColor.h"
 #include "nsCOMPtr.h"