diff --git a/mime/mime.d.ts b/mime/mime.d.ts
index bfaa7a51f..1009f006c 100644
--- a/mime/mime.d.ts
+++ b/mime/mime.d.ts
@@ -16,4 +16,5 @@ declare module "mime" {
 	}
 
 	export var charsets: Charsets;
+	export var default_type: string;
 }