diff --git a/gfx/layers/CompositorTypes.h b/gfx/layers/CompositorTypes.h
index fd67cbedf265..1bb2bf6216fc 100644
--- a/gfx/layers/CompositorTypes.h
+++ b/gfx/layers/CompositorTypes.h
@@ -195,6 +195,18 @@ struct TextureFactoryIdentifier
     , mSupportsBackdropCopyForComponentAlpha(true)
     , mSyncHandle(aSyncHandle)
   {}
+
+  bool operator==(const TextureFactoryIdentifier& aOther) const {
+    return
+      mParentBackend == aOther.mParentBackend &&
+      mParentProcessType == aOther.mParentProcessType &&
+      mMaxTextureSize == aOther.mMaxTextureSize &&
+      mCompositorUseANGLE == aOther.mCompositorUseANGLE &&
+      mSupportsTextureBlitting == aOther.mSupportsTextureBlitting &&
+      mSupportsPartialUploads == aOther.mSupportsPartialUploads &&
+      mSupportsComponentAlpha == aOther.mSupportsComponentAlpha &&
+      mSyncHandle == aOther.mSyncHandle;
+  }
 };
 
 /**