diff --git a/gulp-minify-html/gulp-minify-html-tests.ts b/gulp-minify-html/gulp-minify-html-tests.ts
index 2ec41e556..556ee203b 100644
--- a/gulp-minify-html/gulp-minify-html-tests.ts
+++ b/gulp-minify-html/gulp-minify-html-tests.ts
@@ -8,7 +8,7 @@ minifyHtml();
 minifyHtml({conditionals: true, loose: true});
 
 gulp.task('minify-html', () => {
-    var opts = {
+    var opts: minifyHtml.Options = {
         conditionals: true,
         spare: true
     };
diff --git a/gulp-minify-html/gulp-minify-html.d.ts b/gulp-minify-html/gulp-minify-html.d.ts
index 11ce298a4..321a56925 100644
--- a/gulp-minify-html/gulp-minify-html.d.ts
+++ b/gulp-minify-html/gulp-minify-html.d.ts
@@ -6,32 +6,32 @@
 /// <reference path="../node/node.d.ts" />
 
 declare module 'gulp-minify-html' {
-    interface IOptions {
-        // Do not remove empty attributes
-        empty?: boolean;
+    namespace minifyHtml {
+        interface Options {
+            // Do not remove empty attributes
+            empty?: boolean;
 
-        // Do not strip CDATA from scripts
-        cdata?: boolean;
+            // Do not strip CDATA from scripts
+            cdata?: boolean;
 
-        // Do not remove comments
-        comments?: boolean;
+            // Do not remove comments
+            comments?: boolean;
 
-        // Do not remove conditional internet explorer comments
-        conditionals?: boolean;
+            // Do not remove conditional internet explorer comments
+            conditionals?: boolean;
 
-        // Do not remove redundant attributes
-        spare?: boolean;
+            // Do not remove redundant attributes
+            spare?: boolean;
 
-        // Do not remove arbitrary quotes
-        quotes?: boolean;
+            // Do not remove arbitrary quotes
+            quotes?: boolean;
 
-        // Preserve one whitespace
-        loose?: boolean;
+            // Preserve one whitespace
+            loose?: boolean;
+        }
     }
 
-    function minifyHtml(options?: IOptions): NodeJS.ReadWriteStream;
-
-    namespace minifyHtml {}
+    function minifyHtml(options?: minifyHtml.Options): NodeJS.ReadWriteStream;
 
     export = minifyHtml;
 }