diff --git a/frontend/src/app/components/api/api-v3/query-filter-builder.ts b/frontend/src/app/components/api/api-v3/query-filter-builder.ts
deleted file mode 100644
index 05554f9f4b..0000000000
--- a/frontend/src/app/components/api/api-v3/query-filter-builder.ts
+++ /dev/null
@@ -1,61 +0,0 @@
-//-- copyright
-// OpenProject is a project management system.
-// Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License version 3.
-//
-// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
-// Copyright (C) 2006-2013 Jean-Philippe Lang
-// Copyright (C) 2010-2013 the ChiliProject Team
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License
-// as published by the Free Software Foundation; either version 2
-// of the License, or (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-//
-// See doc/COPYRIGHT.rdoc for more details.
-//++
-
-import {FilterOperator} from "core-components/api/api-v3/api-v3-filter-builder";
-import {ApiV3Paths} from "core-app/modules/common/path-helper/apiv3/apiv3-paths";
-
-export class QueryFilterBuilder {
-
-  constructor(readonly v3:ApiV3Paths) {
-  }
-
-  /**
-   * Build a query filter object by hand.
-   *
-   * @param id
-   * @param operator
-   * @param values
-   */
-  public build(id:string, operator:FilterOperator, values:any[]):Object {
-    return {
-      "_type": "QueryFilter",
-      "_links": {
-        "filter": {
-          "href": this.v3.resource("/queries/filters/" + id)
-        },
-        "schema": {
-          "href": this.v3.resource("/queries/filter_instance_schemas/" + id)
-        },
-        "operator": {
-          "href": this.v3.resource("/queries/operators/" + operator)
-        },
-        "values": values
-      }
-    };
-  }
-}
diff --git a/frontend/src/app/modules/boards/board/board-actions/status-action.service.ts b/frontend/src/app/modules/boards/board/board-actions/status-action.service.ts
index 56136c4d7d..91f469b29a 100644
--- a/frontend/src/app/modules/boards/board/board-actions/status-action.service.ts
+++ b/frontend/src/app/modules/boards/board/board-actions/status-action.service.ts
@@ -4,7 +4,6 @@ import {PathHelperService} from "core-app/modules/common/path-helper/path-helper
 import {Board} from "core-app/modules/boards/board/board";
 import {StatusDmService} from "core-app/modules/hal/dm-services/status-dm.service";
 import {StatusResource} from "core-app/modules/hal/resources/status-resource";
-import {QueryFilterBuilder} from "core-components/api/api-v3/query-filter-builder";
 import {QueryResource} from "core-app/modules/hal/resources/query-resource";
 import {BoardActionService} from "core-app/modules/boards/board/board-actions/board-action.service";
 import {HalResource} from "core-app/modules/hal/resources/hal-resource";
@@ -15,7 +14,6 @@ import {FilterOperator} from "core-components/api/api-v3/api-v3-filter-builder";
 export class BoardStatusActionService implements BoardActionService {
 
   private readonly v3 = this.pathHelper.api.v3;
-  private queryFilterBuilder = new QueryFilterBuilder(this.v3);
 
   constructor(protected pathHelper:PathHelperService,
               protected boardListService:BoardListsService,