diff -udprN /usr/ports/www/mini_httpd/files/patch-scripts_mini__httpd.sh ./files/patch-scripts_mini__httpd.sh
--- /usr/ports/www/mini_httpd/files/patch-scripts_mini__httpd.sh	1970-01-01 00:00:00.000000000 +0000
+++ ./files/patch-scripts_mini__httpd.sh	2021-06-07 03:14:22.004668000 +0000
@@ -0,0 +1,22 @@
+--- scripts/mini_httpd.sh.orig	2016-06-18 20:06:02 UTC
++++ scripts/mini_httpd.sh
+@@ -22,6 +22,7 @@
+ name='mini_httpd'
+ rcvar='mini_httpd_enable'
+ start_precmd='mini_httpd_precmd'
++stop_postcmd='mini_httpd_poststop'
+ mini_httpd_enable_defval='NO'
+ 
+ load_rc_config "$name"
+@@ -38,4 +39,11 @@ mini_httpd_precmd ()
+ 	fi
+ }
+ 
++mini_httpd_poststop ()
++{
++	if [ -n "$mini_httpd_devfs" ]; then
++		umount "$mini_httpd_devfs"
++	fi
++}
++
+ run_rc_command "$1"