diff --git a/types/http-graceful-shutdown/http-graceful-shutdown-tests.ts b/types/http-graceful-shutdown/http-graceful-shutdown-tests.ts
index 2445635c67..6e5413fef3 100644
--- a/types/http-graceful-shutdown/http-graceful-shutdown-tests.ts
+++ b/types/http-graceful-shutdown/http-graceful-shutdown-tests.ts
@@ -6,8 +6,8 @@ const opts: GracefulShutdown.Options = {
     signals: "SIGINT SIGTERM",
     timeout: 1337,
     development: false,
-    onShutdown: () => {
-        console.log('fake shutdown handler');
+    onShutdown: (signal) => {
+        console.log('fake shutdown handler', signal);
         return Promise.resolve();
     },
     finally: () => {
diff --git a/types/http-graceful-shutdown/index.d.ts b/types/http-graceful-shutdown/index.d.ts
index ba34246290..738711759a 100644
--- a/types/http-graceful-shutdown/index.d.ts
+++ b/types/http-graceful-shutdown/index.d.ts
@@ -15,7 +15,7 @@ declare namespace GracefulShutdown {
         signals?: string;
         timeout?: number;
         development?: boolean;
-        onShutdown?: () => Promise<void>;
+        onShutdown?: (signal: string) => Promise<void>;
         finally?: () => void;
     }
 }