diff --git a/src/popupmenu.c b/src/popupmenu.c
index cbb45a5..a28b3e2 100644
--- a/src/popupmenu.c
+++ b/src/popupmenu.c
@@ -387,7 +387,7 @@
  * This will avoid clearing and redrawing the popup menu, prevent flicker.
  */
     void
-pum_call_update_screen()
+pum_call_update_screen(void)
 {
     call_update_screen = TRUE;