diff --git a/frontend/app/components/wp-relations/wp-relation-group/wp-child-relation-group.service.ts b/frontend/app/components/wp-relations/wp-relation-group/wp-child-relation-group.service.ts
index 60a7100853..6c4ff8d40d 100644
--- a/frontend/app/components/wp-relations/wp-relation-group/wp-child-relation-group.service.ts
+++ b/frontend/app/components/wp-relations/wp-relation-group/wp-child-relation-group.service.ts
@@ -45,7 +45,7 @@ export class WorkPackageChildRelationsGroup extends WorkPackageRelationGroup {
     return relation.$load();
   }
 
-  public addWpRelation() {
+  public addWpRelation():ng.IPromise<any> {
     return this.workPackage.project.$load()
       .then(() => {
         const args = [
@@ -60,7 +60,7 @@ export class WorkPackageChildRelationsGroup extends WorkPackageRelationGroup {
           args[0] = 'work-packages.new';
         }
 
-        $state.go(...args);
+        (<any>$state).go(...args);
       });
   }
 
@@ -91,8 +91,8 @@ export class WorkPackageChildRelationsGroup extends WorkPackageRelationGroup {
   }
 }
 
-function wpChildRelationsGroupService() {
-  [$state, $q] = arguments;
+function wpChildRelationsGroupService(...args) {
+  [$state, $q] = args;
   return WorkPackageChildRelationsGroup;
 }
 
diff --git a/frontend/app/components/wp-relations/wp-relation-group/wp-parent-relation-group.service.ts b/frontend/app/components/wp-relations/wp-relation-group/wp-parent-relation-group.service.ts
index 8a1fbc96d8..799827dd62 100644
--- a/frontend/app/components/wp-relations/wp-relation-group/wp-parent-relation-group.service.ts
+++ b/frontend/app/components/wp-relations/wp-relation-group/wp-parent-relation-group.service.ts
@@ -26,8 +26,8 @@
 // See doc/COPYRIGHT.rdoc for more details.
 //++
 
-import {WorkPackageRelationGroup} from "./wp-relation-group.service";
-import {wpTabsModule} from "../../../angular-modules";
+import {WorkPackageRelationGroup} from './wp-relation-group.service';
+import {wpTabsModule} from '../../../angular-modules';
 
 var HalResource;
 var PathHelper:any;
@@ -72,8 +72,8 @@ export class WorkPackageParentRelationGroup extends WorkPackageRelationGroup {
   }
 }
 
-function wpParentRelationGroupService() {
-  [HalResource, PathHelper] = arguments;
+function wpParentRelationGroupService(...args) {
+  [HalResource, PathHelper] = args;
   return WorkPackageParentRelationGroup;
 }
 
diff --git a/frontend/app/components/wp-relations/wp-relation-group/wp-relation-group.service.ts b/frontend/app/components/wp-relations/wp-relation-group/wp-relation-group.service.ts
index a4d19ad76e..d9547c9d06 100644
--- a/frontend/app/components/wp-relations/wp-relation-group/wp-relation-group.service.ts
+++ b/frontend/app/components/wp-relations/wp-relation-group/wp-relation-group.service.ts
@@ -100,7 +100,7 @@ export class WorkPackageRelationGroup {
     return deferred.promise;
   }
 
-  public addWpRelation(wpId:number):ng.IPromise {
+  public addWpRelation(wpId:number):ng.IPromise<any> {
     return this.workPackage.addRelation({
       to_id: wpId,
       relation_type: this.id
@@ -126,8 +126,8 @@ export class WorkPackageRelationGroup {
   }
 }
 
-function wpRelationGroupService() {
-  [$q, $http, PathHelper] = arguments;
+function wpRelationGroupService(...args) {
+  [$q, $http, PathHelper] = args;
   return WorkPackageRelationGroup;
 }