diff --git a/gfx/layers/opengl/TiledThebesLayerOGL.cpp b/gfx/layers/opengl/TiledThebesLayerOGL.cpp
index 30406565a875..ad2e0b059bac 100644
--- a/gfx/layers/opengl/TiledThebesLayerOGL.cpp
+++ b/gfx/layers/opengl/TiledThebesLayerOGL.cpp
@@ -197,7 +197,7 @@ TiledThebesLayerOGL::ProcessUploadQueue()
 }
 
 void
-TiledThebesLayerOGL::RenderTile(TiledTexture aTile,
+TiledThebesLayerOGL::RenderTile(const TiledTexture& aTile,
                                 const gfx3DMatrix& aTransform,
                                 const nsIntPoint& aOffset,
                                 const nsIntRegion& aScreenRegion,
diff --git a/gfx/layers/opengl/TiledThebesLayerOGL.h b/gfx/layers/opengl/TiledThebesLayerOGL.h
index 15324f6dc7f4..22fe41c03bde 100644
--- a/gfx/layers/opengl/TiledThebesLayerOGL.h
+++ b/gfx/layers/opengl/TiledThebesLayerOGL.h
@@ -131,7 +131,7 @@ public:
   void ProcessUploadQueue();
 
   // Renders a single given tile.
-  void RenderTile(TiledTexture aTile,
+  void RenderTile(const TiledTexture& aTile,
                   const gfx3DMatrix& aTransform,
                   const nsIntPoint& aOffset,
                   const nsIntRegion& aScreenRegion,