diff --git a/app/SysTray-X/windowctrl-win.cpp b/app/SysTray-X/windowctrl-win.cpp
index 1eae953..99db018 100644
--- a/app/SysTray-X/windowctrl-win.cpp
+++ b/app/SysTray-X/windowctrl-win.cpp
@@ -18,12 +18,6 @@
  */
 #include <QCoreApplication>
 
-/*
- *  Statics
- */
-quint64 WindowCtrlWin::m_tb_window;
-QList< quint64 >  WindowCtrlWin::m_tb_windows;
-
 
 /*
  *  Constructor
diff --git a/app/SysTray-X/windowctrl-win.h b/app/SysTray-X/windowctrl-win.h
index e41df34..84c5677 100644
--- a/app/SysTray-X/windowctrl-win.h
+++ b/app/SysTray-X/windowctrl-win.h
@@ -206,12 +206,12 @@ class WindowCtrlWin : public QObject
         /**
          * @brief m_tb_window. The Thunderbird window.
          */
-        static quint64  m_tb_window;
+        quint64  m_tb_window;
 
         /**
          * @brief m_tb_window. The Thunderbird windows.
          */
-        static QList< quint64 >  m_tb_windows;
+        QList< quint64 >  m_tb_windows;
 };
 
 #endif // WINDOWCTRLWIN_H