diff --git a/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp b/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp
index 9d2249ed85c..0b5c2c166dc 100644
--- a/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp
+++ b/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp
@@ -304,11 +304,13 @@ nsWebShellWindow::QueryInterface(REFNSIID aIID, void** aInstancePtr)
      NS_ADDREF_THIS();
      return NS_OK;
   }	
+#ifndef NECKO
   if (aIID.Equals(kINetSupportIID )) {
     *aInstancePtr = (void*)(nsINetSupport*)this;
     NS_ADDREF_THIS();
     return NS_OK;
   }
+#endif
   if (aIID.Equals(kISupportsIID)) {
     *aInstancePtr = (void*)(nsISupports*)(nsIWebShellContainer*)this;
     NS_ADDREF_THIS();