diff --git a/toolkit/components/extensions/ExtensionXPCShellUtils.jsm b/toolkit/components/extensions/ExtensionXPCShellUtils.jsm
index ce837bd4eeab..e6c1c5c117b5 100644
--- a/toolkit/components/extensions/ExtensionXPCShellUtils.jsm
+++ b/toolkit/components/extensions/ExtensionXPCShellUtils.jsm
@@ -906,11 +906,10 @@ var ExtensionTestUtils = {
       );
     });
 
-    // Make sure that loading the default settings for url-classifier-skip-urls
-    // doesn't interfere with running our tests while IDB operations are in
-    // flight by overriding the default remote settings bucket pref name to
-    // ensure that the IDB database isn't created in the first place.
-    Services.prefs.setStringPref("services.settings.default_bucket", "foo");
+    Services.prefs.setStringPref(
+      "services.settings.server",
+      "http://localhost:7777/remote-settings-dummy/v1"
+    );
   },
 
   addonManagerStarted: false,