diff --git a/chai/chai.d.ts b/chai/chai.d.ts
index a2ef1379b..ff5526189 100644
--- a/chai/chai.d.ts
+++ b/chai/chai.d.ts
@@ -12,8 +12,8 @@ declare module chai {
         stack: string;
     }
 
-    function expect(target: any, message?: string): Expect;
-    
+    export function expect(target: any, message?: string): Expect;
+
     export var assert: Assert;
     export var config: Config;