diff --git a/lib/libc/stdio/stdio.c b/lib/libc/stdio/stdio.c
index 01d954d8fc25..daae1a2cc98a 100644
--- a/lib/libc/stdio/stdio.c
+++ b/lib/libc/stdio/stdio.c
@@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$");
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include "un-namespace.h"
 #include "local.h"