diff --git a/src/edge.ts b/src/edge.ts
index bc48ef9..465ae0e 100644
--- a/src/edge.ts
+++ b/src/edge.ts
@@ -71,7 +71,7 @@ export class EdgeRouter<Req extends Request = Request, Ctx = unknown> {
   }
 
   public clone() {
-    const r = new EdgeRouter();
+    const r = new EdgeRouter<Req, Ctx>();
     r.router = this.router.clone();
     return r;
   }
diff --git a/src/node.ts b/src/node.ts
index 0d7af25..a4f27f1 100644
--- a/src/node.ts
+++ b/src/node.ts
@@ -75,7 +75,7 @@ export class NodeRouter<
   }
 
   public clone() {
-    const r = new NodeRouter();
+    const r = new NodeRouter<Req, Res>();
     r.router = this.router.clone();
     return r;
   }