diff --git a/node-wit/index.d.ts b/node-wit/index.d.ts
index 4421b1b9b0..9ded60de17 100644
--- a/node-wit/index.d.ts
+++ b/node-wit/index.d.ts
@@ -7,15 +7,15 @@ import * as Promise from "bluebird";
 
 export namespace log {
 
-    class Logger {
+    declare class Logger {
 
         constructor(lvl: string);
     }
 
-    const DEBUG = 'debug';
-    const INFO = 'info';
-    const WARN = 'warn';
-    const ERROR = 'error';
+    declare const DEBUG = 'debug';
+    declare const INFO = 'info';
+    declare const WARN = 'warn';
+    declare const ERROR = 'error';
 }
 
 export interface WitEntityValue {
@@ -78,4 +78,4 @@ export declare class Wit {
     message(message: string, context: WitContext): Promise<MessageResponse>;
     converse(sessinId: string, message: string, context: WitContext, reset?: boolean): Promise<MessageResponse>;
     runActions(sessinId: string, message: string, context: WitContext, maxSteps?: number): Promise<WitContext>;
-}
\ No newline at end of file
+}