diff --git a/setserial.c b/setserial.c
index fef6532768..b7cde26ac2 100644
--- a/setserial.c
+++ b/setserial.c
@@ -10,11 +10,14 @@
  * Last modified: [tytso:19940520.0036EDT]
  */
 
+#include <errno.h>
+#include <fcntl.h>
 #include <stdio.h>
-#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
 #include <termios.h>
-#include <string.h>
-#include <errno.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
 
 #ifdef HAVE_ASM_IOCTLS_H
 #include <asm/ioctls.h>
@@ -714,7 +717,7 @@
 	exit(1);
 }
 
-main(int argc, char **argv)
+int main(int argc, char **argv)
 {
 	int	get_flag = 0, wild_intr_flag = 0;
 	int	c;