diff --git a/WorkFlow.API/Extensions/DIExtensions.cs b/WorkFlow.API/Extensions/DIExtensions.cs
index 565590d..933c9ac 100644
--- a/WorkFlow.API/Extensions/DIExtensions.cs
+++ b/WorkFlow.API/Extensions/DIExtensions.cs
@@ -9,6 +9,6 @@ namespace WorkFlow.API.Extensions
             => services.AddSingleton<APIKeyAuthFilter>(provider => new(isValidKey: isValidKey, headerName: headerName));
 
         public static IServiceCollection AddAPIKeyAuth(this IServiceCollection services, APIKeyAuthOptions options)
-            => services.AddAPIKeyAuth(isValidKey: key => key == options.Key, headerName: options.HeaderName);
+            => services.AddAPIKeyAuth(isValidKey: key => options.Key is null || options.Key == key, headerName: options.HeaderName);
     }
 }
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