diff --git a/mozilla/content/base/src/nsContentIterator.cpp b/mozilla/content/base/src/nsContentIterator.cpp
index aae704ac442..725b0ac37e6 100644
--- a/mozilla/content/base/src/nsContentIterator.cpp
+++ b/mozilla/content/base/src/nsContentIterator.cpp
@@ -612,7 +612,7 @@ nsresult nsContentSubtreeIterator::Init(nsIDOMRange* aRange)
   if (!aRange) 
     return NS_ERROR_NULL_POINTER; 
 
-  mRange = aRange;
+  mRange = do_QueryInterface(aRange);
   
   // get the start node and offset, convert to nsIContent
   nsCOMPtr<nsIDOMNode> commonParent;
diff --git a/mozilla/layout/base/src/nsContentIterator.cpp b/mozilla/layout/base/src/nsContentIterator.cpp
index aae704ac442..725b0ac37e6 100644
--- a/mozilla/layout/base/src/nsContentIterator.cpp
+++ b/mozilla/layout/base/src/nsContentIterator.cpp
@@ -612,7 +612,7 @@ nsresult nsContentSubtreeIterator::Init(nsIDOMRange* aRange)
   if (!aRange) 
     return NS_ERROR_NULL_POINTER; 
 
-  mRange = aRange;
+  mRange = do_QueryInterface(aRange);
   
   // get the start node and offset, convert to nsIContent
   nsCOMPtr<nsIDOMNode> commonParent;