diff --git a/types/stoppable/index.d.ts b/types/stoppable/index.d.ts
index d5414157b8..a127bdc9b0 100644
--- a/types/stoppable/index.d.ts
+++ b/types/stoppable/index.d.ts
@@ -3,6 +3,6 @@
 // Definitions by: Eric Byers <https://github.com/EricByers>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-declare function stoppable(server:http.Server, grace?:number) => http.Server;
+declare function stoppable(server:http.Server, grace?:number): http.Server;
 
 export = stoppable;