diff --git a/cmd/nginx-auth/nginx-auth.go b/cmd/nginx-auth/nginx-auth.go
index ee55ca74f..53dcb9596 100644
--- a/cmd/nginx-auth/nginx-auth.go
+++ b/cmd/nginx-auth/nginx-auth.go
@@ -75,12 +75,7 @@ func main() {
 				log.Printf("can't extract tailnet name from hostname %q", info.Node.Name)
 				return
 			}
-			tailnet, _, ok = strings.Cut(tailnet, ".beta.tailscale.net")
-			if !ok {
-				w.WriteHeader(http.StatusUnauthorized)
-				log.Printf("can't extract tailnet name from hostname %q", info.Node.Name)
-				return
-			}
+			tailnet = strings.TrimSuffix(tailnet, ".beta.tailscale.net")
 		}
 
 		if expectedTailnet := r.Header.Get("Expected-Tailnet"); expectedTailnet != "" && expectedTailnet != tailnet {