--- a/setserial.c
+++ b/setserial.c
@@ -738,7 +738,7 @@ fprintf(stderr, "\t* port\t\tset the I/O port\n");
 	exit(1);
 }
 
-main(int argc, char **argv)
+int main(int argc, char **argv)
 {
 	int	get_flag = 0, wild_intr_flag = 0;
 	int	c;