diff --git a/cli/dts/lib.deno.unstable.d.ts b/cli/dts/lib.deno.unstable.d.ts
index bb93eac8de..34102da1d0 100644
--- a/cli/dts/lib.deno.unstable.d.ts
+++ b/cli/dts/lib.deno.unstable.d.ts
@@ -1117,7 +1117,7 @@ declare namespace Deno {
     | {
       success: false;
       code: number;
-      signal: string | null;
+      signal: Signal | null;
     };
 
   export interface SpawnOutput<T extends SpawnOptions> {