diff --git a/src/xlspwin.c b/src/xlspwin.c
index 0bd4494..f14773c 100644
--- a/src/xlspwin.c
+++ b/src/xlspwin.c
@@ -335,7 +335,7 @@ void set_Xmouseposition(int x, int y)
 /*									*/
 /************************************************************************/
 
-void DoRing() {
+void DoRing(void) {
   DLword w, r;
   KBEVENT *kbevent;