diff --git a/include/wx/gtk/app.h b/include/wx/gtk/app.h
index 3fb0e93c8a..33b62e1c15 100644
--- a/include/wx/gtk/app.h
+++ b/include/wx/gtk/app.h
@@ -56,9 +56,6 @@ public:
 #endif // __WXDEBUG__
 
     gint            m_idleTag;
-#if wxUSE_THREADS
-    gint            m_wakeUpTimerTag;
-#endif
     unsigned char  *m_colorCube;
 
     // Used by the the wxGLApp and wxGLCanvas class for GL-based X visual
diff --git a/include/wx/gtk1/app.h b/include/wx/gtk1/app.h
index 3fb0e93c8a..33b62e1c15 100644
--- a/include/wx/gtk1/app.h
+++ b/include/wx/gtk1/app.h
@@ -56,9 +56,6 @@ public:
 #endif // __WXDEBUG__
 
     gint            m_idleTag;
-#if wxUSE_THREADS
-    gint            m_wakeUpTimerTag;
-#endif
     unsigned char  *m_colorCube;
 
     // Used by the the wxGLApp and wxGLCanvas class for GL-based X visual