diff --git a/src/screen.c b/src/screen.c
index ea557b9..f55dba6 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -416,7 +416,7 @@
  * it belongs. If highlighting was changed a redraw is needed.
  */
     void
-redraw_after_callback()
+redraw_after_callback(void)
 {
     if (State == HITRETURN || State == ASKMORE)
 	; /* do nothing */
@@ -10252,7 +10252,7 @@
  * Clear the mode message.
  */
     void
-clearmode()
+clearmode(void)
 {
     msg_pos_mode();
     if (Recording)