diff --git a/gfx/src/mac/nsRenderingContextMac.h b/gfx/src/mac/nsRenderingContextMac.h
index 57323ae69e1a..dd1925305e46 100644
--- a/gfx/src/mac/nsRenderingContextMac.h
+++ b/gfx/src/mac/nsRenderingContextMac.h
@@ -40,6 +40,8 @@ class nsGraphicState;
 class DrawingSurface;		// a surface is a combination of a port and a graphic state
 class nsUnicodeFallbackCache;
 
+class nsIGraphics;
+
 //------------------------------------------------------------------------