diff --git a/src/emulator/auth/handlers.ts b/src/emulator/auth/handlers.ts
index a92088220c0..f08ed8dca14 100644
--- a/src/emulator/auth/handlers.ts
+++ b/src/emulator/auth/handlers.ts
@@ -268,7 +268,7 @@ export function registerHandlers(
       authEvent: authEvent || { type: 'unknown', error: { code: 'auth/no-auth-event' } },
     }, function(responses) {
       if (!responses || !responses.length ||
-          !responses[responses.length - 1].status === 'ACK') {
+          responses[responses.length - 1].status !== 'ACK') {
         return alert("Auth Emulator Internal Error: Sending authEvent failed.");
       }
     }, gapi.iframes.CROSS_ORIGIN_IFRAMES_FILTER);