diff --git a/_infrastructure/tests/runner.js b/_infrastructure/tests/runner.js
index 81416ca018..9a3647abdd 100644
--- a/_infrastructure/tests/runner.js
+++ b/_infrastructure/tests/runner.js
@@ -850,7 +850,7 @@ var DT;
 
     var Promise = require('bluebird');
 
-    var endDts = /\w\.ts$/i;
+    var endDts = /\w\.d\.ts$/i;
 
     /////////////////////////////////
     // .d.ts syntax inspection
diff --git a/_infrastructure/tests/src/suite/syntax.ts b/_infrastructure/tests/src/suite/syntax.ts
index 9211c3fdef..915fd18d07 100644
--- a/_infrastructure/tests/src/suite/syntax.ts
+++ b/_infrastructure/tests/src/suite/syntax.ts
@@ -6,7 +6,7 @@ module DT {
 
 	var Promise: typeof Promise = require('bluebird');
 
-	var endDts = /\w\.ts$/i;
+	var endDts = /\w\.d\.ts$/i;
 
 	/////////////////////////////////
 	// .d.ts syntax inspection