diff --git a/docshell/test/browser/browser_bug503832.js b/docshell/test/browser/browser_bug503832.js
index a3f320fc6f02..4a0217907cf9 100644
--- a/docshell/test/browser/browser_bug503832.js
+++ b/docshell/test/browser/browser_bug503832.js
@@ -26,7 +26,6 @@ function test() {
                 // If titles for fragment URLs aren't set, this code
                 // branch won't be called and the test will timeout,
                 // resulting in a failure
-                historyService.removeObserver(historyObserver, false);
                 finish();
             }
         },