diff --git a/plugins/system/systemd_units b/plugins/system/systemd_units
index 4f9ec61c..34563fd3 100755
--- a/plugins/system/systemd_units
+++ b/plugins/system/systemd_units
@@ -60,14 +60,12 @@ EOF
 }
 
 fetch () {
-	tmp=$(mktemp -t munin-systemd_units.XXXXXX)
-	trap "rm \"$tmp\"" EXIT
-	systemctl --no-pager --no-legend --all | awk '{print $1, $3}' > "$tmp"
+	tmp=$(systemctl --no-pager --no-legend --all | awk '{print $1, $3}')
 	for state in \
 		$states ; do
 	echo -n "$state.value "
-	grep -c "$state$" "$tmp"
-	extinfo=$(grep "$state$" "$tmp" | cut -d " " -f 1)
+	echo "$tmp" | grep -c "$state$"
+	extinfo=$(echo "$tmp" | grep "$state$" | cut -d " " -f 1)
 	if [ -n "$extinfo" ]; then
 		echo "$state.extinfo" $extinfo
 	fi