diff --git a/lib/src/common.dart b/lib/src/common.dart
index fac9f6c..ab1b86d 100644
--- a/lib/src/common.dart
+++ b/lib/src/common.dart
@@ -17,7 +17,7 @@ enum HandlerType {
 
 ///
 class Handler {
-  Handler({this.type = HandlerType.route, this.handlerFunc});
+  const Handler({this.type = HandlerType.route, this.handlerFunc});
   final HandlerType type;
   final HandlerFunc handlerFunc;
 }