diff --git a/roles/lmn_vm/files/pam-umount.sh b/roles/lmn_vm/files/pam-umount.sh
index 57093e6..38e41df 100644
--- a/roles/lmn_vm/files/pam-umount.sh
+++ b/roles/lmn_vm/files/pam-umount.sh
@@ -7,6 +7,8 @@ set -eu
 usr="$1"
 uid="$2"
 mtp="$3"
+slce="system-virtiofs.slice"
+slp=false
 
 shutdownVMs(){
     local VM
@@ -19,6 +21,7 @@ shutdownVMs(){
 	     XDG_CONFIG_HOME="/tmp/$uid/.config/" \
 	     XDG_CACHE_HOME="/var/cache/user/$uid/" \
 	     virsh destroy "$VM" 2>&1 | systemd-cat || true
+	slp=true
     done
 }
 
@@ -27,10 +30,10 @@ shutdownVMs(){
 ## This is the first mount we need to get rid of:
 if [[ "$mtp" =~ "/lmn/media/$usr/share" ]] ; then
     shutdownVMs
-    sleep 5 # leave some time to write caches …
+    [[ "$slp" = true ]] && sleep 5 # leave some time to write caches …
     sudo -u ${usr} killall gvfsd | systemd-cat
     sudo -u ${usr} killall dbus-daemon | systemd-cat
-    systemctl kill system-virtiofs.slice || true
+    systemctl -q is-active "$slce" && systemctl kill "$slce"
     # debug to find processes blocking umount:
     # lsof >> /var/log/lsof.log
 fi