diff --git a/syno_hdd_db.sh b/syno_hdd_db.sh
index 7264a9f..e68bb26 100755
--- a/syno_hdd_db.sh
+++ b/syno_hdd_db.sh
@@ -197,9 +197,25 @@ else
 fi
 
 
+PS4func() {
+    local lineno="$1"
+    local i f=''
+    local c="\033[0;36m" y="\033[0;33m" n="\033[0m"
+    local d=$((${#FUNCNAME[@]}-2))
+
+    if [[ $lineno == 1 ]]
+    then lineno=0
+    fi
+
+    for ((i=d; i>0; i--))
+    do printf -v f "%s%s()" "$f" "${FUNCNAME[i]}"
+    done
+
+    printf "$y%s:%04d$c%s$n " "${BASH_SOURCE[1]##*/}" "$lineno" "$f"
+}
 if [[ $debug == "yes" ]]; then
-    set -x
-    export PS4='`[[ $? == 0 ]] || echo "\e[1;31;40m($?)\e[m\n "`:.$LINENO:'
+    PS4='\r$(PS4func $LINENO)'
+    set -o xtrace
 fi