diff --git a/src/proto.h b/src/proto.h
index d89c847..2471bb6 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -20,7 +20,7 @@
  * Machine-dependent routines.
  */
 /* avoid errors in function prototypes */
-# if !defined(FEAT_X11) && !defined(FEAT_GUI_GTK)
+# if !defined(FEAT_X11) && !defined(FEAT_GUI_GTK) && !defined(FEAT_GUI_KDE)
 #  define Display int
 #  define Widget int
 # endif
@@ -180,6 +180,10 @@
 #  ifdef FEAT_GUI_W32
 #   include "gui_w32.pro"
 #  endif
+#  ifdef FEAT_GUI_KDE
+#   include "gui_kde.pro"
+#   include "gui_kde_x11.pro"
+#  endif
 #  ifdef FEAT_GUI_GTK
 #   include "gui_gtk.pro"
 #   include "gui_gtk_x11.pro"