diff --git a/usr.sbin/pppd/ipcp.c b/usr.sbin/pppd/ipcp.c
index 3c8eba86a219..3369757aab7b 100644
--- a/usr.sbin/pppd/ipcp.c
+++ b/usr.sbin/pppd/ipcp.c
@@ -26,6 +26,7 @@ static char rcsid[] = "$FreeBSD$";
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
 #include <netdb.h>
diff --git a/usr.sbin/pppd/ipv6cp.c b/usr.sbin/pppd/ipv6cp.c
index 3071a9e23052..27ba3a96d6cb 100644
--- a/usr.sbin/pppd/ipv6cp.c
+++ b/usr.sbin/pppd/ipv6cp.c
@@ -110,6 +110,7 @@ __FBSDID("$FreeBSD$");
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
 #include <unistd.h>