diff --git a/appl/ftp/common/buffer.c b/appl/ftp/common/buffer.c
index e385966ce..ab5535cbc 100644
--- a/appl/ftp/common/buffer.c
+++ b/appl/ftp/common/buffer.c
@@ -38,6 +38,7 @@
 
 #include "common.h"
 #include <stdio.h>
+#include <err.h>
 #include "roken.h"
 
 RCSID("$Id$");