diff --git a/htdocs/lib/databases/mysql.lib.php b/htdocs/lib/databases/mysql.lib.php
index 1c5ad2aa97c..1586a53dc7a 100644
--- a/htdocs/lib/databases/mysql.lib.php
+++ b/htdocs/lib/databases/mysql.lib.php
@@ -119,8 +119,8 @@ class DoliDb
   function DoliDb($type='mysql', $host, $user, $pass, $name='', $newlink=0)
   {
     global $conf,$langs;
-	$conffile = "../conf/conf.php";
-	if (file_exists($conffile)) {
+    $conffile = DOL_DOCUMENT_ROOT."/conf/conf.php";
+    if (file_exists($conffile)) {
 	    include($conffile);
 	    $this->forcecharset=$character_set_database;
 	    $this->forcecollate=$collation_connection;
diff --git a/htdocs/lib/databases/mysqli.lib.php b/htdocs/lib/databases/mysqli.lib.php
index 599aa6469e0..78f8f62751e 100644
--- a/htdocs/lib/databases/mysqli.lib.php
+++ b/htdocs/lib/databases/mysqli.lib.php
@@ -119,7 +119,7 @@ class DoliDb
     {
         global $conf,$langs;
         
-        $conffile = "../../conf/conf.php";
+        $conffile = DOL_DOCUMENT_ROOT."/conf/conf.php";
         if (file_exists($conffile)) {
 	    	include($conffile);
 	    	$this->forcecharset=$character_set_database;
diff --git a/htdocs/lib/databases/pgsql.lib.php b/htdocs/lib/databases/pgsql.lib.php
index 27400a1e099..b4a2e8374c7 100644
--- a/htdocs/lib/databases/pgsql.lib.php
+++ b/htdocs/lib/databases/pgsql.lib.php
@@ -74,9 +74,9 @@ class DoliDb
     */
     function DoliDb($type='pgsql', $host, $user, $pass, $name='')
     {
-        global $conf,$langs;
-        $conffile = "../conf/conf.php";
-		if (file_exists($conffile)) {	
+    	global $conf,$langs;
+      $conffile = DOL_DOCUMENT_ROOT."/conf/conf.php";
+      if (file_exists($conffile)) {	
 	    	include($conffile);
 	    	$this->forcecharset=$character_set_database;
 	    	$this->db_user=$dolibarr_main_db_user;