diff --git a/gulp-jshint/gulp-jshint.d.ts b/gulp-jshint/gulp-jshint.d.ts
index 8c10fe0de..20db40a62 100644
--- a/gulp-jshint/gulp-jshint.d.ts
+++ b/gulp-jshint/gulp-jshint.d.ts
@@ -23,7 +23,7 @@ declare module "gulp-jshint" {
     }
 
     namespace GulpJSHint { 
-        function reporter(kind: (string | Object));
+        function reporter(kind: (string | Object)): NodeJS.ReadWriteStream;
     }
     export = GulpJSHint;
 }
diff --git a/gulp-notify/gulp-notify.d.ts b/gulp-notify/gulp-notify.d.ts
index 34b752065..96b11f95d 100644
--- a/gulp-notify/gulp-notify.d.ts
+++ b/gulp-notify/gulp-notify.d.ts
@@ -88,7 +88,7 @@ declare module "gulp-notify" {
         /**
          * The exact same API as using notify(), but where a vinyl File is passed, the error object is passed instead.
          */
-        function onError(param: string | (error: Error): string | GulpNotifyOptions): NodeJS.ReadWriteStream;
+        function onError(param: string | { (error: Error): string } | GulpNotifyOptions): NodeJS.ReadWriteStream;
 
         /**
          * Type: Integer Default: 2