--- a/gfx/layers/d3d11/CompositorD3D11.hlsl
+++ b/gfx/layers/d3d11/CompositorD3D11.hlsl
@@ -316,17 +316,17 @@ float4 ComputeBlendSourceColor(const VS_
     if (iBlendConfig.x == PS_LAYER_RGB) {
       return RGBShader(tmp);
     } else if (iBlendConfig.x == PS_LAYER_RGBA) {
       return RGBAShader(tmp);
     } else if (iBlendConfig.x == PS_LAYER_YCBCR) {
       return YCbCrShader(tmp);
     }
     return SolidColorShader(tmp);
-  } else if (iBlendConfig.y == PS_MASK_2D) {
+  } else if (iBlendConfig.y == PS_MASK) {
     VS_MASK_OUTPUT tmp;
     tmp.vPosition = aVertex.vPosition;
     tmp.vTexCoords = aVertex.vTexCoords;
     tmp.vMaskCoords = aVertex.vMaskCoords;
 
     if (iBlendConfig.x == PS_LAYER_RGB) {
       return RGBShaderMask(tmp);
     } else if (iBlendConfig.x == PS_LAYER_RGBA) {