diff --git a/src/mollie/callback.php b/src/mollie/callback.php
index f3d166f..338b5ce 100644
--- a/src/mollie/callback.php
+++ b/src/mollie/callback.php
@@ -4,8 +4,8 @@
  *	Setting requirements and includes
  *
  */
-require_once '../../../init.php';
-require_once 'vendor/Mollie/src/Mollie/API/Autoloader.php';
+require_once __DIR__ . '/../../../init.php';
+require_once __DIR__ . '/vendor/Mollie/src/Mollie/API/Autoloader.php';
 
 $whmcs->load_function('gateway');
 $whmcs->load_function('invoice');
diff --git a/src/mollie/mollie.php b/src/mollie/mollie.php
index 1e1c743..d8a812e 100644
--- a/src/mollie/mollie.php
+++ b/src/mollie/mollie.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'vendor/Mollie/src/Mollie/API/Autoloader.php';
+require_once __DIR__ . '/vendor/Mollie/src/Mollie/API/Autoloader.php';
 
 function mollie_config() {
     return array(
diff --git a/src/molliebanktransfer.php b/src/molliebanktransfer.php
index 4929670..5396a7a 100755
--- a/src/molliebanktransfer.php
+++ b/src/molliebanktransfer.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliebanktransfer_config() {
 	$config = mollie_config();
diff --git a/src/molliebelfius.php b/src/molliebelfius.php
index 5a675d6..74af4c5 100755
--- a/src/molliebelfius.php
+++ b/src/molliebelfius.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliebelfius_config() {
 	$config = mollie_config();
diff --git a/src/molliebitcoin.php b/src/molliebitcoin.php
index 6921e10..5f84cb8 100755
--- a/src/molliebitcoin.php
+++ b/src/molliebitcoin.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliebitcoin_config() {
 	$config = mollie_config();
diff --git a/src/molliedirectdebit.php b/src/molliedirectdebit.php
index cbabd63..94af38f 100755
--- a/src/molliedirectdebit.php
+++ b/src/molliedirectdebit.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliedirectdebit_config() {
 	$config = mollie_config();
diff --git a/src/mollieideal.php b/src/mollieideal.php
index fdeb8f9..ecd86f5 100755
--- a/src/mollieideal.php
+++ b/src/mollieideal.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function mollieideal_config() {
 	$config = mollie_config();
diff --git a/src/molliemistercash.php b/src/molliemistercash.php
index 62a04e5..6cd350d 100755
--- a/src/molliemistercash.php
+++ b/src/molliemistercash.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliemistercash_config() {
 	$config = mollie_config();
diff --git a/src/molliepaypal.php b/src/molliepaypal.php
index c3f2394..37f3924 100755
--- a/src/molliepaypal.php
+++ b/src/molliepaypal.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliepaypal_config() {
 	$config = mollie_config();
diff --git a/src/molliepaysafecard.php b/src/molliepaysafecard.php
index be9995c..55b9cb7 100755
--- a/src/molliepaysafecard.php
+++ b/src/molliepaysafecard.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliepaysafecard_config() {
 	$config = mollie_config();
diff --git a/src/molliesofort.php b/src/molliesofort.php
index 3eb53e1..f947bce 100755
--- a/src/molliesofort.php
+++ b/src/molliesofort.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once 'mollie/mollie.php';
+require_once __DIR__ . '/mollie/mollie.php';
 
 function molliesofort_config() {
 	$config = mollie_config();