diff -urN lrzsz-0.12.20/src/lrz.c lrzsz-0.12.20.new/src/lrz.c
--- lrzsz-0.12.20/src/lrz.c	1998-12-30 08:49:24.000000000 +0100
+++ lrzsz-0.12.20.new/src/lrz.c	2014-05-12 16:50:38.212549624 +0200
@@ -2319,7 +2319,7 @@
 	if (*s == '!')
 		++s;
 	io_mode(0,0);
-	execl("/bin/sh", "sh", "-c", s);
+	execl("/bin/sh", "sh", "-c", s, NULL);
 	zpfatal("execl");
 	exit(1);
 }