diff --git a/mobile-detect/mobile-detect-tests.ts b/mobile-detect/mobile-detect-tests.ts
index 694d3cd89a..64dbddc1af 100644
--- a/mobile-detect/mobile-detect-tests.ts
+++ b/mobile-detect/mobile-detect-tests.ts
@@ -1,6 +1,6 @@
 /// <reference path="mobile-detect.d.ts" />
 
-var md: MobileDetect;
+var md: MobileDetect = new MobileDetect(window.navigator.userAgent);
 
 var mobie: string = md.mobile()
 var phone: string = md.phone()
diff --git a/mobile-detect/mobile-detect.d.ts b/mobile-detect/mobile-detect.d.ts
index c24b2ea676..180fd06643 100644
--- a/mobile-detect/mobile-detect.d.ts
+++ b/mobile-detect/mobile-detect.d.ts
@@ -5,7 +5,7 @@
 
 declare class MobileDetect {
 	
-	contructor(userAgent: string, maxPhoneWidth?: number): MobileDetect;
+	constructor(userAgent: string, maxPhoneWidth?: number);
 	
 	is(key: string): boolean;
 	match(pattern: string|RegExp): boolean