diff -ru a/src/yersinia.c b/src/yersinia.c
--- a/src/yersinia.c	2025-01-06 20:10:12.501482780 +0400
+++ b/src/yersinia.c	2025-01-06 20:11:08.635172681 +0400
@@ -927,7 +927,7 @@
  * POSIX functions for signals 
  */
 int 
-posix_signal( int signo, void (*handler)() )
+posix_signal( int signo, void (*handler)(int) )
 {
     struct sigaction act;