diff --git a/scripts/background.js b/scripts/background.js
index 2b382c8..439e912 100644
--- a/scripts/background.js
+++ b/scripts/background.js
@@ -25,7 +25,7 @@ function setProxy(proxy) {
     browser.webRequest.onAuthRequired.removeListener(sendAuth);
   }
 
-  if (requestProxy.username) {
+  if (proxy.username) {
     requestProxy.username = credential.username = proxy.username;
     requestProxy.password = credential.password = proxy.password;
     sendAuth = async () => {