diff --git a/types/debug/index.d.ts b/types/debug/index.d.ts
index 9d6814cf9a..ccc2c363af 100644
--- a/types/debug/index.d.ts
+++ b/types/debug/index.d.ts
@@ -7,7 +7,7 @@
 //                 Nicolas Penin <https://github.com/npenin>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-declare var debug: debug.IDebug & {debug: debug.IDebug, default: debug.IDebug};
+declare var debug: debug.Debug & {debug: debug.Debug, default: debug.Debug};
 
 export = debug;
 export as namespace debug;