diff --git a/src/app_ex.cpp b/src/app_ex.cpp
index c24bc464..1854cb3d 100644
--- a/src/app_ex.cpp
+++ b/src/app_ex.cpp
@@ -1,6 +1,7 @@
 
 #ifdef __WXGTK__
 #include <gdk/gdkx.h>
+#include <gtk/gtk.h>
 #include <wx/gtk/private/win_gtk.h>
 #endif
 
diff --git a/src/window_ex.cpp b/src/window_ex.cpp
index f2128727..30378888 100644
--- a/src/window_ex.cpp
+++ b/src/window_ex.cpp
@@ -5,6 +5,7 @@
 
 #ifdef __WXGTK__
 #include <gdk/gdkx.h>
+#include <gtk/gtk.h>
 #include <wx/gtk/private/win_gtk.h>
 #define GetXWindow(wxwin) (wxwin)->m_wxwindow ? \
                           GDK_WINDOW_XWINDOW((wxwin)->m_wxwindow->window) : \