diff --git a/karma.conf.js b/karma.conf.js
index 2546c9e..a2425cb 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -34,7 +34,7 @@ module.exports = function(config) {
             // paths to support debugging with source maps in dev tools
             {pattern: 'src/**/*.ts', included: false, watched: true},
             {pattern: 'test/**/*.ts', included: false, watched: true},
-            {pattern: 'dist/**/*.js.map', included: false, watched: true},
+ //           {pattern: 'dist/**/*.js.map', included: false, watched: true},
             {pattern: 'dist/**/*.js', included: false, watched: true},  // test again for coverage
             'karma-test-shim.js'
         ],
diff --git a/package.json b/package.json
index 3e79462..a8782fb 100644
--- a/package.json
+++ b/package.json
@@ -55,6 +55,7 @@
     "karma-spec-reporter": "0.0.26",
     "lodash": "^4.13.1",
     "remap-istanbul": "0.6.x",
+    "reflect-metadata": "^0.1.3",
     "rxjs": "~5.0.0-beta.6",
     "systemjs": "^0.19.31",
     "systemjs-builder": "^0.15.13",
diff --git a/src/decorators.ts b/src/decorators.ts
index 07015c2..650dbea 100644
--- a/src/decorators.ts
+++ b/src/decorators.ts
@@ -1,3 +1,5 @@
+/// <reference path="../node_modules/reflect-metadata/reflect-metadata.d.ts" />
+
 /**
  * Created by haiko on 28-5-16.
  */
diff --git a/src/form-object.builder.ts b/src/form-object.builder.ts
index 177446e..780b89a 100644
--- a/src/form-object.builder.ts
+++ b/src/form-object.builder.ts
@@ -1,3 +1,6 @@
+/// <reference path="../node_modules/reflect-metadata/reflect-metadata.d.ts" />
+
+
 /**
  * Created by haiko on 18-4-16.
  *
@@ -6,7 +9,6 @@
 import { Validators, Control, ControlGroup } from '@angular/common';
 import 'rxjs/add/operator/debounceTime';
 import * as _ from 'lodash';
-import 'reflect-metadata';
 import { FormValidators } from './form.validators';
 import * as decorator from './decorators';
 
diff --git a/tsconfig.json b/tsconfig.json
index 0bf3a20..2bc03b9 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,9 +10,6 @@
         "declaration": true,
         "outDir": "./dist"
     },
-    "definitions": [
-        "node_modules/reflect-metadata/reflect-metadata.d.ts"
-    ],
     "exclude": [
         "node_modules"
     ]