diff --git a/types/alexa-sdk/index.d.ts b/types/alexa-sdk/index.d.ts
index 7f3f022137..a621634417 100644
--- a/types/alexa-sdk/index.d.ts
+++ b/types/alexa-sdk/index.d.ts
@@ -39,7 +39,7 @@ interface Handler {
     context: any;
     name: any;
     isOverriden: any;
-    t: (token: String) => void;
+    t: (token: string) => void;
 }
 
 interface Context {