diff --git a/src/proto/gui_gtk_x11.pro b/src/proto/gui_gtk_x11.pro
index 93b65bf..d80ba82 100644
--- a/src/proto/gui_gtk_x11.pro
+++ b/src/proto/gui_gtk_x11.pro
@@ -9,6 +9,8 @@
 int gui_mch_showing_tabline __ARGS((void));
 void gui_mch_update_tabline __ARGS((void));
 void gui_mch_set_curtab __ARGS((int nr));
+void gui_gtk_set_selection_targets __ARGS((void));
+void gui_gtk_set_dnd_targets __ARGS((void));
 int gui_mch_init __ARGS((void));
 void gui_mch_forked __ARGS((void));
 void gui_mch_new_colors __ARGS((void));