diff --git a/lib/krb5/verify_krb5_conf.c b/lib/krb5/verify_krb5_conf.c
index b656a860e..2a3e70dd6 100644
--- a/lib/krb5/verify_krb5_conf.c
+++ b/lib/krb5/verify_krb5_conf.c
@@ -34,6 +34,7 @@
 #include "krb5_locl.h"
 #include <getarg.h>
 #include <parse_bytes.h>
+#include <err.h>
 RCSID("$Id$");
 
 /* verify krb5.conf */