diff --git a/types/debug/index.d.ts b/types/debug/index.d.ts
index 2067b27222..954ca3a35a 100644
--- a/types/debug/index.d.ts
+++ b/types/debug/index.d.ts
@@ -16,7 +16,7 @@ declare namespace debug {
     interface Debug {
         (namespace: string): Debugger;
         coerce: (val: any) => any;
-        disable: () => void;
+        disable: () => string;
         enable: (namespaces: string) => void;
         enabled: (namespaces: string) => boolean;