diff --git a/src/conio/mouse.h b/src/conio/mouse.h
index 9dab8e1e1f6a80d872291654088be133983e4cdb..bd5e4fcdeba17e0555d85a5fcc81f146c4257a1a 100644
--- a/src/conio/mouse.h
+++ b/src/conio/mouse.h
@@ -101,6 +101,7 @@ extern "C" {
 void ciomouse_gotevent(int event, int x, int y);
 int mouse_pending(void);
 int ciolib_getmouse(struct mouse_event *mevent);
+int ciolib_ungetmouse(struct mouse_event *mevent);
 void ciolib_mouse_thread(void *data);
 int ciomouse_setevents(int events);
 int ciomouse_addevents(int events);