diff --git a/ntex/src/web/config.rs b/ntex/src/web/config.rs
index 0f7ef423..04ca90c7 100644
--- a/ntex/src/web/config.rs
+++ b/ntex/src/web/config.rs
@@ -152,7 +152,7 @@ mod tests {
     use crate::http::{Method, StatusCode};
     use crate::util::Bytes;
     use crate::web::test::{call_service, init_service, read_body, TestRequest};
-    use crate::web::{self, App, HttpRequest, HttpResponse};
+    use crate::web::{self, App, DefaultError, HttpRequest, HttpResponse};
 
     #[crate::rt_test]
     async fn test_configure_state() {
@@ -225,4 +225,11 @@ mod tests {
         let resp = call_service(&srv, req).await;
         assert_eq!(resp.status(), StatusCode::OK);
     }
+
+    #[test]
+    fn test_service_config_register() {
+        let cfg: ServiceConfig<DefaultError> = ServiceConfig::register();
+        assert!(cfg.services.is_empty());
+        assert!(cfg.external.is_empty());
+    }
 }