diff --git a/htdocs/core/db/mssql.class.php b/htdocs/core/db/mssql.class.php
index 9067effca1d..5c4439bd083 100644
--- a/htdocs/core/db/mssql.class.php
+++ b/htdocs/core/db/mssql.class.php
@@ -38,9 +38,9 @@ class DoliDBMssql
 	//! Database label
 	static $label='MSSQL';
 	//! Charset used to force charset when creating database
-	static $forcecharset='latin1';
+	var $forcecharset='latin1';      // Can't be static as it may be forced with a dynamic value
 	//! Collate used to force collate when creating database
-	static $forcecollate='latin1_swedish_ci';
+	var $forcecollate='latin1_swedish_ci';      // Can't be static as it may be forced with a dynamic value
 	//! Version min database
 	static $versionmin=array(2000);
 	//! Resultset of last request
diff --git a/htdocs/core/db/mysql.class.php b/htdocs/core/db/mysql.class.php
index d8f18d2971c..cd295d68cc2 100644
--- a/htdocs/core/db/mysql.class.php
+++ b/htdocs/core/db/mysql.class.php
@@ -38,9 +38,9 @@ class DoliDBMysql
 	//! Database label
 	static $label='MySQL';
 	//! Charset used to force charset when creating database
-	static $forcecharset='utf8';	// latin1, utf8
+	var $forcecharset='utf8';	// latin1, utf8. Can't be static as it may be forced with a dynamic value
 	//! Collate used to force collate when creating database
-	static $forcecollate='utf8_general_ci';	// latin1_swedish_ci, utf8_general_ci
+	var $forcecollate='utf8_general_ci';	// latin1_swedish_ci, utf8_general_ci. Can't be static as it may be forced with a dynamic value
 	//! Version min database
 	static $versionmin=array(4,1,0);
 	//! Resultset of last request
diff --git a/htdocs/core/db/mysqli.class.php b/htdocs/core/db/mysqli.class.php
index 3fbda6c3613..6b82861d1f7 100644
--- a/htdocs/core/db/mysqli.class.php
+++ b/htdocs/core/db/mysqli.class.php
@@ -38,9 +38,9 @@ class DoliDBMysqli
     //! Database label
     static $label='MySQL';
     //! Charset used to force charset when creating database
-    static $forcecharset='utf8';	// latin1, utf8
+    var $forcecharset='utf8';	// latin1, utf8. Can't be static as it may be forced with a dynamic value
     //! Collate used to force collate when creating database
-    static $forcecollate='utf8_general_ci';	// latin1_swedish_ci, utf8_general_ci
+    var $forcecollate='utf8_general_ci';	// latin1_swedish_ci, utf8_general_ci. Can't be static as it may be forced with a dynamic value
     //! Version min database
     static $versionmin=array(4,1,0);
 	//! Resultset of last request
@@ -83,7 +83,7 @@ class DoliDBMysqli
     function DoliDBMysqli($type, $host, $user, $pass, $name='', $port=0)
     {
         global $conf,$langs;
-        
+
         // TODO error in strict mode (static property for "$forcecharset" and "$forcecollate")
         //if (! empty($conf->db->character_set)) $this->forcecharset=$conf->db->character_set;
         //if (! empty($conf->db->dolibarr_main_db_collation)) $this->forcecollate=$conf->db->dolibarr_main_db_collation;
diff --git a/htdocs/core/db/pgsql.class.php b/htdocs/core/db/pgsql.class.php
index beff42d7840..fa0a3b0eef4 100644
--- a/htdocs/core/db/pgsql.class.php
+++ b/htdocs/core/db/pgsql.class.php
@@ -40,7 +40,7 @@ class DoliDBPgsql
     //! Database label
 	static $label='PostgreSQL';      // Label of manager
 	//! Charset
-	static $forcecharset='latin1';
+	var $forcecharset='latin1';      // Can't be static as it may be forced with a dynamic value
 	//! Version min database
 	static $versionmin=array(8,4,0);	// Version min database
 
@@ -81,8 +81,9 @@ class DoliDBPgsql
 	{
 		global $conf,$langs;
 
-		$this->forcecharset=$conf->file->character_set_client;
-		$this->forcecollate=$conf->db->dolibarr_main_db_collation;
+		if (! empty($conf->db->character_set)) $this->forcecharset=$conf->db->character_set;
+		if (! empty($conf->db->dolibarr_main_db_collation))	$this->forcecollate=$conf->db->dolibarr_main_db_collation;
+
 		$this->database_user=$user;
 
 		$this->transaction_opened=0;
diff --git a/htdocs/core/db/sqlite.class.php b/htdocs/core/db/sqlite.class.php
index 06d1a460976..673d5c1d4e7 100644
--- a/htdocs/core/db/sqlite.class.php
+++ b/htdocs/core/db/sqlite.class.php
@@ -38,9 +38,9 @@ class DoliDBSqlite
     //! Database label
     static $label='PDO Sqlite';
     //! Charset used to force charset when creating database
-    static $forcecharset='utf8';	// latin1, utf8
+    var $forcecharset='utf8';	// latin1, utf8. Can't be static as it may be forced with a dynamic value
     //! Collate used to force collate when creating database
-    static $forcecollate='utf8_general_ci';	// latin1_swedish_ci, utf8_general_ci
+    var $forcecollate='utf8_general_ci';	// latin1_swedish_ci, utf8_general_ci. Can't be static as it may be forced with a dynamic value
     //! Version min database
     static $versionmin=array(3,0,0);
 	//! Resultset of last request