diff --git a/application/palemoon/base/content/tabbrowser.xml b/application/palemoon/base/content/tabbrowser.xml
index bd67ab0903..20cb7a5537 100644
--- a/application/palemoon/base/content/tabbrowser.xml
+++ b/application/palemoon/base/content/tabbrowser.xml
@@ -2137,7 +2137,7 @@
             // Using the "STOP_ALL" flag should halt all animations, fetches, network
             // activity, etc. to come to a clean state for removal and unlinking (if enabled).
             var browser = this.getBrowserForTab(aTab);
-            browser.webNavigation.stop(nsIWebNavigation.STOP_ALL);
+            browser.webNavigation.stop(Ci.nsIWebNavigation.STOP_ALL);
             
             // Clean up mTabFilters and mTabListeners now rather than in
             // _beginRemoveTab, so that their size is always in sync with the