diff --git a/gfx/thebes/gfxPlatformMac.cpp b/gfx/thebes/gfxPlatformMac.cpp
index b4db5bad824..12375d21f4d 100644
--- a/gfx/thebes/gfxPlatformMac.cpp
+++ b/gfx/thebes/gfxPlatformMac.cpp
@@ -71,7 +71,7 @@ gfxPlatformMac::gfxPlatformMac()
     mFontAntiAliasingThreshold = ReadAntiAliasingThreshold();
 
     uint32_t canvasMask = (1 << BACKEND_CAIRO) | (1 << BACKEND_SKIA) | (1 << BACKEND_COREGRAPHICS);
-    uint32_t contentMask = (1 << BACKEND_COREGRAPHICS);
+    uint32_t contentMask = 0;
     InitBackendPrefs(canvasMask, contentMask);
 }