--- a/gfx/layers/opengl/CompositorOGL.cpp
+++ b/gfx/layers/opengl/CompositorOGL.cpp
@@ -1360,17 +1360,18 @@ CompositorOGL::DrawQuad(const Rect& aRec
         BindMaskForProgram(program, sourceMask, LOCAL_GL_TEXTURE1, maskQuadTransform);
       }
       if (mixBlendBackdrop) {
         BindBackdrop(program, mixBlendBackdrop, LOCAL_GL_TEXTURE2);
       }
 
       if (config.mFeatures & ENABLE_TEXTURE_RECT) {
         // 2DRect case, get the multiplier right for a sampler2DRect
-        program->SetTexCoordMultiplier(aRect.width, aRect.height);
+        program->SetTexCoordMultiplier(surface->GetSize().width,
+                                       surface->GetSize().height);
       }
 
       // Drawing is always flipped, but when copying between surfaces we want to avoid
       // this. Pass true for the flip parameter to introduce a second flip
       // that cancels the other one out.
       didSetBlendMode = SetBlendMode(gl(), blendMode);
       BindAndDrawQuad(program, aRect);
     }