diff --git a/browser/base/content/tabbrowser.xml b/browser/base/content/tabbrowser.xml
index 9444b5f6b18..97ee062859d 100644
--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -1165,7 +1165,7 @@
 
               if (aPostData === undefined)
                 aPostData = null;
-              b.loadURIWithFlags(aURI, nsIWebNavigation.LOAD_FLAGS_NONE,
+              b.loadURIWithFlags(aURI, Components.interfaces.nsIWebNavigation.LOAD_FLAGS_NONE,
                                  aReferrerURI, aCharset, aPostData);
             }