diff --git a/auth0_flutter/example/ios/Tests/WebAuth/WebAuthSpies.swift b/auth0_flutter/example/ios/Tests/WebAuth/WebAuthSpies.swift
index 088546bb..b3db2ab8 100644
--- a/auth0_flutter/example/ios/Tests/WebAuth/WebAuthSpies.swift
+++ b/auth0_flutter/example/ios/Tests/WebAuth/WebAuthSpies.swift
@@ -137,6 +137,8 @@ class SpyWebAuth: WebAuth {
         calledLogout = true
         callback(logoutResult)
     }
+
+    func onClose(_ callback: (() -> Void)?) -> Self {}
 }
 
 class MockWebAuthUserAgent: WebAuthUserAgent {