diff --git a/plugins/system/cpubyuser b/plugins/system/cpubyuser
index 04dc2c2f..39469981 100755
--- a/plugins/system/cpubyuser
+++ b/plugins/system/cpubyuser
@@ -39,6 +39,9 @@
 
 . "$MUNIN_LIBDIR/plugins/plugin.sh"
 
+[ "$USERS" = "ALL" ] && USERS=$(w --no-header | awk '{ print $1 }' | sort | uniq)
+
+
 if [ "$1" = "autoconf" ]; then
 	if [ -n "$USERS" ]; then
 		echo "yes"
@@ -68,10 +71,6 @@ if [ "$1" = "config" ]; then
 	exit
 fi
 
-if [ "$USERS" = "ALL" ]; then
-       USERS=$( w | awk '{ print $1 }' )
-fi
-
 top -b -n 1 | tail -n +8 | \
 	awk -v USERS="$USERS" '
 		{ if ($2 != "USER") CPU_USER[$2]+=$9 }