diff --git a/src/client/app/frameworks/i18n/services/multilingual.service.ts b/src/client/app/frameworks/i18n/services/multilingual.service.ts
index f1f78716c1820332547b969af7aceaaee55b652e..39b1b05ec7cdcf3d8da57b18b782cdc01131ad05 100644
--- a/src/client/app/frameworks/i18n/services/multilingual.service.ts
+++ b/src/client/app/frameworks/i18n/services/multilingual.service.ts
@@ -32,7 +32,7 @@ export const MULTILINGUAL_ACTIONS: any = {
 export const multilingualReducer: ActionReducer<MultilingualStateI> = (state: MultilingualStateI = initialState, action: Action) => {
   switch (action.type) {
     case MULTILINGUAL_ACTIONS.LANG_CHANGE:
-      return Object.assign({}, state, action.payload);
+      return (<any>Object).assign({}, state, action.payload);
     default:
       return state;
   }