diff --git a/packages/firebase_auth/firebase_auth/example/lib/auth.dart b/packages/firebase_auth/firebase_auth/example/lib/auth.dart
index b78c948e9f0e..7db2971bcb12 100644
--- a/packages/firebase_auth/firebase_auth/example/lib/auth.dart
+++ b/packages/firebase_auth/firebase_auth/example/lib/auth.dart
@@ -256,7 +256,8 @@ class _AuthGateState extends State<AuthGate> {
                                             height: 50,
                                             child: SignInButton(
                                               button,
-                                              onPressed: authButtons[button],
+                                              // ignore: unnecessary_null_checks
+                                              onPressed: authButtons[button]!,
                                             ),
                                           ),
                                   ),