diff --git a/gfx/2d/2D.h b/gfx/2d/2D.h
index eeb6915bc218..3006c73e5cba 100644
--- a/gfx/2d/2D.h
+++ b/gfx/2d/2D.h
@@ -1300,6 +1300,7 @@ public:
 
   /**
    * Performs an in-place edge padding operation.
+   * aRegion is specified in device space.
    */
   virtual void PadEdges(const IntRegion& aRegion);
 
diff --git a/gfx/layers/client/MultiTiledContentClient.cpp b/gfx/layers/client/MultiTiledContentClient.cpp
index 7155b602f6a9..6c0ba6062bc6 100644
--- a/gfx/layers/client/MultiTiledContentClient.cpp
+++ b/gfx/layers/client/MultiTiledContentClient.cpp
@@ -270,7 +270,7 @@ void ClientMultiTiledLayerBuffer::Update(const nsIntRegion& newValidRegion,
 
       // Edge padding allows us to avoid resampling artifacts
       if (gfxPrefs::TileEdgePaddingEnabled() && mResolution == 1) {
-        drawTarget->PadEdges(newValidRegion);
+        drawTarget->PadEdges(newValidRegion.MovedBy(-mTilingOrigin));
       }
 
       // Reset