diff --git a/modules/di/src/binding.js b/modules/di/src/binding.js
index 56b7ba7988..c07f6cde73 100644
--- a/modules/di/src/binding.js
+++ b/modules/di/src/binding.js
@@ -1,10 +1,10 @@
-import {Type} from 'facade/lang';
+import {Type, bool} from 'facade/lang';
 import {List, MapWrapper, ListWrapper} from 'facade/collection';
 import {Reflector} from './reflector';
 import {Key, Dependency} from './key';
 
 export class Binding {
-  constructor(key:Key, factory:Function, dependencies:List, providedAsFuture) {
+  constructor(key:Key, factory:Function, dependencies:List, providedAsFuture:bool) {
     this.key = key;
     this.factory = factory;
     this.dependencies = dependencies;
diff --git a/modules/di/src/injector.js b/modules/di/src/injector.js
index 560f6b93c6..642fc7f8fc 100644
--- a/modules/di/src/injector.js
+++ b/modules/di/src/injector.js
@@ -2,7 +2,7 @@ import {Map, List, MapWrapper, ListWrapper} from 'facade/collection';
 import {Binding, BindingBuilder, bind} from './binding';
 import {ProviderError, NoProviderError, InvalidBindingError,
   AsyncBindingError, CyclicDependencyError, InstantiationError} from './exceptions';
-import {Type, isPresent, isBlank} from 'facade/lang';
+import {Type, isPresent, isBlank, bool} from 'facade/lang';
 import {Future, FutureWrapper} from 'facade/async';
 import {Key} from './key';
 
@@ -13,7 +13,7 @@ class _Waiting {
     this.future = future;
   }
 }
-function _isWaiting(obj) {
+function _isWaiting(obj):bool {
   return obj instanceof _Waiting;
 }
 
@@ -62,7 +62,7 @@ export class Injector {
     return ListWrapper.createFixedSize(Key.numberOfKeys() + 1);
   }
 
-  _getByKey(key:Key, returnFuture, returnLazy) {
+  _getByKey(key:Key, returnFuture:bool, returnLazy:bool) {
     if (returnLazy) {
       return () => this._getByKey(key, returnFuture, false);
     }
diff --git a/modules/di/src/key.js b/modules/di/src/key.js
index f9b626f5cb..442a41a118 100644
--- a/modules/di/src/key.js
+++ b/modules/di/src/key.js
@@ -1,11 +1,12 @@
 import {MapWrapper} from 'facade/collection';
+import {int, bool} from 'facade/lang';
 
 var _allKeys = {};
-var _id = 0;
+var _id:int = 0;
 
 //TODO: vsavkin: move to binding once cyclic deps are supported
 export class Dependency {
-  constructor(key:Key, asFuture, lazy){
+  constructor(key:Key, asFuture:bool, lazy:bool){
     this.key = key;
     this.asFuture = asFuture;
     this.lazy = lazy;
@@ -13,7 +14,7 @@ export class Dependency {
 }
 
 export class Key {
-  constructor(token, id) {
+  constructor(token, id:int) {
     this.token = token;
     this.id = id;
   }
diff --git a/modules/di/src/reflector.es6 b/modules/di/src/reflector.es6
index 5c30839446..ec6db41bc9 100644
--- a/modules/di/src/reflector.es6
+++ b/modules/di/src/reflector.es6
@@ -38,7 +38,7 @@ export class Reflector {
     }
 
     if (isPresent(type)) {
-      return this._createDependency(type, false);
+      return this._createDependency(type, false, false);
     } else {
       throw new NoAnnotationError(constructedType);
     }