diff --git a/plugins/system/cpubyuser b/plugins/system/cpubyuser
index 5c1020a7..f2c548f1 100755
--- a/plugins/system/cpubyuser
+++ b/plugins/system/cpubyuser
@@ -56,14 +56,14 @@ if [ "$1" = "config" ]; then
 	echo "graph_vlabel %"
 	echo "graph_scale no"
 	echo "graph_period second"
-	_USERS="$(for user in $USERS; do clean_fieldname "$user" | tr '\n' ' '; done)"
-	echo "graph_order $_USERS others"
-	for USER in $USERS "others"; do
-	        _USER="$(clean_fieldname "$USER")"
-		echo "${_USER}.label $USER"
-		echo "${_USER}.info CPU used by user $USER"
-		echo "${_USER}.type GAUGE"
-		echo "${_USER}.draw AREASTACK"
+	user_fields="$(for user in $USERS; do clean_fieldname "$user" | tr '\n' ' '; done)"
+	echo "graph_order $user_fields others"
+	for user in $USERS "others"; do
+	        user_field="$(clean_fieldname "$user")"
+		echo "${user_field}.label $user"
+		echo "${user_field}.info CPU used by user $user"
+		echo "${user_field}.type GAUGE"
+		echo "${user_field}.draw AREASTACK"
 	done
 	exit
 fi