diff --git a/applets/kimpanel/backend/ibus/ibus15/enginemanager.h b/applets/kimpanel/backend/ibus/ibus15/enginemanager.h
index 011af0128..5caccbcdb 100644
--- a/applets/kimpanel/backend/ibus/ibus15/enginemanager.h
+++ b/applets/kimpanel/backend/ibus/ibus15/enginemanager.h
@@ -1,59 +1,59 @@
 /*
  *  Copyright (C) 2014 Weng Xuetian <wengxt@gmail.com>
  *
  *  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) version 3 or any later version
  *  accepted by the membership of KDE e.V. (or its successor approved
  *  by the membership of KDE e.V.), which shall act as a proxy
  *  defined in Section 14 of version 3 of the license.
  *
  *  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, see <http://www.gnu.org/licenses/>.
  */
 #ifndef ENGINEMANAGER_H
 #define ENGINEMANAGER_H
 #include <ibus.h>
 #include <QByteArray>
 #include <QList>
 #include <QString>
 #include <QMap>
 #include <QQueue>
 #include <QStringList>
 
 class EngineManager {
 public:
     EngineManager();
-    ~EngineManager() override;
+    virtual ~EngineManager();
 
     void setEngines(IBusEngineDesc** engines);
     IBusEngineDesc** engines() { return m_engines; }
     size_t length() { return m_length; }
     void setUseGlobalEngine(gboolean g_variant_get_boolean);
     void setCurrentContext(const gchar* input_context_path);
     QString currentEngine();
     bool useGlobalEngine() { return m_useGlobalEngine; }
     void setCurrentEngine(const char* name);
     const char* navigate(IBusEngineDesc* engine, bool forward);
     void moveToFirst(IBusEngineDesc* engine_desc);
     QStringList engineOrder();
     void setOrder(const gchar** engine_names, size_t len);
     size_t getIndexByName(const char* name);
 
 private:
     QQueue<QString> m_history;
     QMap<QString, QString> m_engineMap;
     QString m_currentContext;
     IBusEngineDesc** m_engines;
     size_t m_length;
     bool m_useGlobalEngine;
     void freeOldEngine();
 };
 
 #endif // PROPERTYMANAGER_H
diff --git a/applets/kimpanel/backend/ibus/ibus15/propertymanager.h b/applets/kimpanel/backend/ibus/ibus15/propertymanager.h
index 0a98fc663..87cfbe0f9 100644
--- a/applets/kimpanel/backend/ibus/ibus15/propertymanager.h
+++ b/applets/kimpanel/backend/ibus/ibus15/propertymanager.h
@@ -1,40 +1,40 @@
 /*
  *  Copyright (C) 2014 Weng Xuetian <wengxt@gmail.com>
  *
  *  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) version 3 or any later version
  *  accepted by the membership of KDE e.V. (or its successor approved
  *  by the membership of KDE e.V.), which shall act as a proxy
  *  defined in Section 14 of version 3 of the license.
  *
  *  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, see <http://www.gnu.org/licenses/>.
  */
 #ifndef PROPERTYMANAGER_H
 #define PROPERTYMANAGER_H
 #include <ibus.h>
 #include <QByteArray>
 
 class PropertyManager {
 public:
     PropertyManager();
-    ~PropertyManager() override;
+    virtual ~PropertyManager();
 
     void setProperties(IBusPropList* props);
     void updateProperty(IBusProperty* prop);
     IBusProperty* property(const QByteArray& key);
     IBusPropList* properties() { return m_props; }
 
 private:
     IBusPropList* m_props;
     IBusProperty* searchList(const QByteArray& key, IBusPropList* props);
 };
 
 #endif // PROPERTYMANAGER_H