diff --git a/content-type/content-type-tests.ts b/content-type/content-type-tests.ts
index 0e5eb2c048..f173a1efbb 100644
--- a/content-type/content-type-tests.ts
+++ b/content-type/content-type-tests.ts
@@ -15,3 +15,5 @@ obj = contentType.parse(res);
 
 var str: string = contentType.format({type: 'image/svg+xml'});
 
+var media: contentType.MediaType;
+contentType.format(media);
diff --git a/content-type/index.d.ts b/content-type/index.d.ts
index 0095367565..3dd39182f4 100644
--- a/content-type/index.d.ts
+++ b/content-type/index.d.ts
@@ -3,10 +3,10 @@
 // Definitions by: Hiroki Horiuchi <https://github.com/horiuchi>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
-declare var x: ContentType.StaticFunctions;
-export = x;
+declare var ct: ct.StaticFunctions;
+export = ct;
 
-declare namespace ContentType {
+declare namespace ct {
     interface StaticFunctions {
         parse(string: string): MediaType;
         parse(req: { headers: any; }): MediaType;