diff --git a/chai/chai-tests.ts b/chai/chai-tests.ts
index ab26aadbc..3774e3895 100644
--- a/chai/chai-tests.ts
+++ b/chai/chai-tests.ts
@@ -1,5 +1,6 @@
 /// <reference path="chai.d.ts" />
 
+var chai: chai;
 var expect = chai.expect;
 
 function test_be() {
diff --git a/chai/chai.d.ts b/chai/chai.d.ts
index 5034b8153..f74673727 100644
--- a/chai/chai.d.ts
+++ b/chai/chai.d.ts
@@ -33,9 +33,9 @@ declare module chai {
         (expected: RegExp, message?: string);
     }
 
-    interface TypeComparison { 
+    interface TypeComparison {
         (type: string, message?: string): bool;
-         instanceof(type: Object): bool;
+        instanceof(type: Object): bool;
     }
 
     interface NumericComparison {
@@ -116,7 +116,10 @@ declare module chai {
         to: To;
     }
 
-    var expect : {
-        (target: any): ExpectMatchers;
+}
+
+interface chai {
+    expect: {
+        (target: any): chai.ExpectMatchers;
     }
-}
\ No newline at end of file
+}