diff --git a/mozilla/editor/libeditor/html/nsWSRunObject.cpp b/mozilla/editor/libeditor/html/nsWSRunObject.cpp
index fd884718902..2d3c3c267d7 100644
--- a/mozilla/editor/libeditor/html/nsWSRunObject.cpp
+++ b/mozilla/editor/libeditor/html/nsWSRunObject.cpp
@@ -1427,7 +1427,7 @@ nsWSRunObject::PrepareToDeleteRangePriv(nsWSRunObject* aEndObject)
       aEndObject->GetCharAfter(aEndObject->mNode, aEndObject->mOffset, &point);
       if (point.mTextNode && nsCRT::IsAsciiSpace(point.mChar))
       {
-        res = ConvertToNBSP(point);
+        res = aEndObject->ConvertToNBSP(point);
         NS_ENSURE_SUCCESS(res, res);
       }
     }