diff --git a/src/app/shared/services/permission.service.ts b/src/app/shared/services/permission.service.ts
index e71a8c7..243b967 100644
--- a/src/app/shared/services/permission.service.ts
+++ b/src/app/shared/services/permission.service.ts
@@ -1,10 +1,8 @@
 import {Injectable, Inject} from "ng-forward";
 
-type WithPermissions = noosfero.Profile | noosfero.Comment | noosfero.Article;
-
 @Injectable()
 export class PermissionService {
-    isAllowed(target: WithPermissions, permission: string) {
+    isAllowed(target: noosfero.ModelWithPermissions, permission: string) {
         return (target.permissions || []).indexOf(permission) >= 0;
     }
 
diff --git a/src/lib/ng-noosfero-api/interfaces/article.ts b/src/lib/ng-noosfero-api/interfaces/article.ts
index 2c9f34e..f1c8ef2 100644
--- a/src/lib/ng-noosfero-api/interfaces/article.ts
+++ b/src/lib/ng-noosfero-api/interfaces/article.ts
@@ -1,6 +1,6 @@
 
 namespace noosfero {
-    export interface Article extends RestModel {
+    export interface Article extends RestModel, ModelWithPermissions {
         abstract: string;
         path: string;
         profile: Profile;
@@ -16,7 +16,5 @@ namespace noosfero {
         start_date: string;
         end_date: string;
         accept_comments: boolean;
-
-        permissions: string[];
     }
 }
diff --git a/src/lib/ng-noosfero-api/interfaces/comment.ts b/src/lib/ng-noosfero-api/interfaces/comment.ts
index 2f8a3c3..b773a9c 100644
--- a/src/lib/ng-noosfero-api/interfaces/comment.ts
+++ b/src/lib/ng-noosfero-api/interfaces/comment.ts
@@ -1,11 +1,10 @@
 namespace noosfero {
-    export interface Comment extends RestModel {
+    export interface Comment extends RestModel, ModelWithPermissions {
         source_id: number;
         reply_of_id: number;
         reply_of: Comment;
         replies: Comment[];
         body: string;
-        permissions: string[];
     }
 
     export interface CommentViewModel extends Comment {
diff --git a/src/lib/ng-noosfero-api/interfaces/profile.ts b/src/lib/ng-noosfero-api/interfaces/profile.ts
index 607270b..fc73fd5 100644
--- a/src/lib/ng-noosfero-api/interfaces/profile.ts
+++ b/src/lib/ng-noosfero-api/interfaces/profile.ts
@@ -6,7 +6,7 @@ namespace noosfero {
  * @description
  *  A representation of a Noosfero Profile.
  */
-    export interface Profile extends RestModel {
+    export interface Profile extends RestModel, ModelWithPermissions {
         /**
          * @ngdoc property
          * @name id
@@ -79,8 +79,6 @@ namespace noosfero {
          */
         custom_footer: string;
 
-        permissions: string[];
-
         /**
          * @ngdoc property
          * @name layout_template
--
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