diff --git a/man2/sendmmsg.2 b/man2/sendmmsg.2
index 3c077f920..64a0edb7d 100644
--- a/man2/sendmmsg.2
+++ b/man2/sendmmsg.2
@@ -183,7 +183,7 @@ The contents of the first datagram originates from a pair of buffers.
 #include <sys/socket.h>
 
 int
-main()
+main(void)
 {
     int sockfd;
     struct sockaddr_in sa;