diff --git a/WoWsShipBuilder.Web/Features/Authentication/AuthController.cs b/WoWsShipBuilder.Web/Features/Authentication/AuthController.cs
index 68efdd70e..783bc0b83 100644
--- a/WoWsShipBuilder.Web/Features/Authentication/AuthController.cs
+++ b/WoWsShipBuilder.Web/Features/Authentication/AuthController.cs
@@ -53,7 +53,7 @@ public Task<ActionResult> AuthenticationCanceled(string status, string message,
         return Task.FromResult<ActionResult>(Redirect("/"));
     }
 
-    [HttpGet("login/{server}")]
+    [HttpGet("login/{server:regex(^eu|asia|com$):required}")]
     public Task<ActionResult> Login(string server)
     {
         string baseUrl = $"{Request.Scheme}://{Request.Host}{Request.PathBase}";