diff --git a/base/pcap-snoop.c b/base/pcap-snoop.c
index e664a3d..fa89e1b 100644
--- a/base/pcap-snoop.c
+++ b/base/pcap-snoop.c
@@ -86,7 +86,7 @@ static int pcap_if_type=DLT_NULL;
 int err_exit PROTO_LIST((char *str,int num));
 int usage PROTO_LIST((void));
 int print_version PROTO_LIST((void));
-void sig_handler PROTO_LIST((void));
+void sig_handler PROTO_LIST((int sig));
 void pcap_cb PROTO_LIST((u_char *ptr,struct pcap_pkthdr *hdr,u_char *data));
 int main PROTO_LIST((int argc,char **argv));
 
@@ -124,7 +124,7 @@ int print_version()
     exit(0);
   }
 
-void sig_handler()
+void sig_handler(int sig)
   {
     fflush(stdout);
     exit(0);