diff --git a/lib/libc/regex/grot/main.c b/lib/libc/regex/grot/main.c
index 72319f6f4944..880e69eb6fff 100644
--- a/lib/libc/regex/grot/main.c
+++ b/lib/libc/regex/grot/main.c
@@ -1,11 +1,13 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <stdio.h>
-#include <string.h>
 #include <sys/types.h>
-#include <regex.h>
 #include <assert.h>
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
 #include "main.ih"