diff --git a/browser/base/content/browser-syncui.js b/browser/base/content/browser-syncui.js
index 1cc1c780b2d5..1f0f733c22e7 100644
--- a/browser/base/content/browser-syncui.js
+++ b/browser/base/content/browser-syncui.js
@@ -141,7 +141,7 @@ let gSyncUI = {
   },
 
   onSetupComplete: function SUI_onSetupComplete() {
-    onLoginFinish();
+    this.onLoginFinish();
   },
 
   onLoginError: function SUI_onLoginError() {