--- libaitcli/src/aitcli.c	2025/12/17 23:30:11	1.20
+++ libaitcli/src/aitcli.c	2025/12/17 23:41:04	1.21
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: aitcli.c,v 1.20 2025/12/17 23:30:11 misho Exp $
+* $Id: aitcli.c,v 1.21 2025/12/17 23:41:04 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -558,7 +558,7 @@ cli_Printf(linebuffer_t * __restrict cli_buffer, char 
 	FILE *f;
 
 	if (fmt) {
-		f = fdopen(cli_buffer->line_out, "a");
+		f = fdopen(dup(cli_buffer->line_out), "a");
 		if (!f) {
 			LOGERR;
 			return;