diff -up netkit-ftp-0.17/ftp/cmds.c.orig netkit-ftp-0.17/ftp/cmds.c
--- netkit-ftp-0.17/ftp/cmds.c.orig	2011-09-05 14:41:34.000000000 +0200
+++ netkit-ftp-0.17/ftp/cmds.c	2011-09-05 14:44:44.000000000 +0200
@@ -499,6 +499,9 @@ usage:
 	}
 	sendrequest(cmd, argv[1], argv[2],
 	    argv[1] != oldargv1 || argv[2] != oldargv2);
+	if (argv[1] != oldargv1) {
+		free(argv[1]);
+	}
 }
 
 void mabort(int);