diff --git a/content/canvas/src/CanvasRenderingContext2D.h b/content/canvas/src/CanvasRenderingContext2D.h
index 436196c03cdc..5480ac36e31b 100644
--- a/content/canvas/src/CanvasRenderingContext2D.h
+++ b/content/canvas/src/CanvasRenderingContext2D.h
@@ -143,7 +143,8 @@ public:
 
   nsHTMLCanvasElement* GetCanvas() const
   {
-    return mCanvasElement;
+    // corresponds to changes to the old bindings made in bug 745025
+    return mCanvasElement->GetOriginalCanvas();
   }
 
   void Save();
diff --git a/content/html/content/public/nsHTMLCanvasElement.h b/content/html/content/public/nsHTMLCanvasElement.h
index 9c5cf5feb1f1..5a9b50f4009b 100644
--- a/content/html/content/public/nsHTMLCanvasElement.h
+++ b/content/html/content/public/nsHTMLCanvasElement.h
@@ -173,7 +173,7 @@ protected:
   void CallPrintCallback();
 
   nsString mCurrentContextId;
-  nsCOMPtr<nsIDOMHTMLCanvasElement> mOriginalCanvas;
+  nsRefPtr<nsHTMLCanvasElement> mOriginalCanvas;
   nsCOMPtr<nsIPrintCallback> mPrintCallback;
   nsCOMPtr<nsICanvasRenderingContextInternal> mCurrentContext;
   nsCOMPtr<nsHTMLCanvasPrintState> mPrintState;
@@ -193,7 +193,7 @@ public:
 
   void ResetPrintCallback();
 
-  nsIDOMHTMLCanvasElement* GetOriginalCanvas();
+  nsHTMLCanvasElement* GetOriginalCanvas();
 };
 
 inline nsISupports*
diff --git a/content/html/content/src/nsHTMLCanvasElement.cpp b/content/html/content/src/nsHTMLCanvasElement.cpp
index 69cb4446f9c3..e02f83ec907b 100644
--- a/content/html/content/src/nsHTMLCanvasElement.cpp
+++ b/content/html/content/src/nsHTMLCanvasElement.cpp
@@ -307,7 +307,7 @@ nsHTMLCanvasElement::IsPrintCallbackDone()
   return mPrintState->mIsDone;
 }
 
-nsIDOMHTMLCanvasElement*
+nsHTMLCanvasElement*
 nsHTMLCanvasElement::GetOriginalCanvas()
 {
   return mOriginalCanvas ? mOriginalCanvas.get() : this;