diff --git a/plugins/system/cpubyuser b/plugins/system/cpubyuser
index b56859c5..424bc2cf 100755
--- a/plugins/system/cpubyuser
+++ b/plugins/system/cpubyuser
@@ -70,9 +70,9 @@ if [ "$1" = "config" ]; then
 	exit
 fi
 
-ps -e -o "%C%U" | \
+top -b -n 1 | tail -n +8 | \
 	awk -v USERS="$USERS" '
-		{ if ($2 != "USER") CPU_USER[$2]+=$1 }
+		{ if ($2 != "USER") CPU_USER[$2]+=$9 }
 		END {
 			others_sum = 0
 			for (user in CPU_USER) {