diff --git a/lib/main.sh b/lib/main.sh
index 3fabacb..d95e067 100644
--- a/lib/main.sh
+++ b/lib/main.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # load utils
-for util in ${PWD}/lib/utils/*.sh; do
+for util in ${DIR}/lib/utils/*.sh; do
   . $util
 done
 
@@ -16,10 +16,10 @@ main_defaults () {
     DEFAULT_REPORTER=stdout
   fi
   if [ -z $CUSTOM_REPORTERS_PATH ]; then
-    CUSTOM_REPORTERS_PATH=${PWD}/reporters/custom
+    CUSTOM_REPORTERS_PATH=${DIR}/reporters/custom
   fi
   if [ -z $CUSTOM_METRICS_PATH ]; then
-    CUSTOM_METRICS_PATH=${PWD}/metrics/custom
+    CUSTOM_METRICS_PATH=${DIR}/metrics/custom
   fi
 }
 
diff --git a/lib/utils/loader.sh b/lib/utils/loader.sh
index 2c021c3..9fe62f7 100644
--- a/lib/utils/loader.sh
+++ b/lib/utils/loader.sh
@@ -2,7 +2,7 @@
 
 get_available_reporters () {
   local result
-  for file in `ls ${PWD}/reporters/*.sh $CUSTOM_REPORTERS_PATH/*.sh 2> /dev/null`; do
+  for file in `ls ${DIR}/reporters/*.sh $CUSTOM_REPORTERS_PATH/*.sh 2> /dev/null`; do
     local filename=$(basename $file)
     local reporter=${filename%.*}
     result=$(echo "$result $reporter")
@@ -12,7 +12,7 @@ get_available_reporters () {
 
 get_available_metrics () {
   local result
-  for file in `ls ${PWD}/metrics/*.sh $CUSTOM_METRICS_PATH/*.sh 2> /dev/null`; do
+  for file in `ls ${DIR}/metrics/*.sh $CUSTOM_METRICS_PATH/*.sh 2> /dev/null`; do
     local filename=$(basename $file)
     local metric=${filename%.*}
     # register metric
@@ -26,7 +26,7 @@ load_reporter_with_prefix () {
   local name=$2
 
   local file
-  for dir in $CUSTOM_REPORTERS_PATH ${PWD}/reporters; do
+  for dir in $CUSTOM_REPORTERS_PATH ${DIR}/reporters; do
     if [ -f $dir/$name.sh ]; then
       file=$dir/$name.sh
       break
@@ -53,7 +53,7 @@ load_metric_with_prefix () {
   local name=$2
 
   local file
-  for dir in $CUSTOM_METRICS_PATH ${PWD}/metrics; do
+  for dir in $CUSTOM_METRICS_PATH ${DIR}/metrics; do
     if [ -f $dir/$name.sh ]; then
       file=$dir/$name.sh
       break
diff --git a/metrics.sh b/metrics.sh
index ff8dc40..257ef34 100755
--- a/metrics.sh
+++ b/metrics.sh
@@ -4,7 +4,7 @@
 LC_ALL=en_US.UTF-8
 LANG=en_US.UTF-8
 LANGUAGE=en_US.UTF-8
-PWD=$(dirname "$0")
+DIR=$(dirname "$0")
 
 usage () {
   echo "  Usage: $0 [-d] [-h] [-v] [-c] [-m] [-r] [-i] [-C] [-u]"
@@ -91,7 +91,7 @@ while [ $# -gt 0 ]; do
 done
 
 # run
-. ${PWD}/lib/main.sh
+. ${DIR}/lib/main.sh
 
 if [ $opt_do_update = true ]; then
   if ! command_exists git; then