diff --git a/htdocs/societe/class/societe.class.php b/htdocs/societe/class/societe.class.php
index 9078b2146d4..c1fd09c6c50 100644
--- a/htdocs/societe/class/societe.class.php
+++ b/htdocs/societe/class/societe.class.php
@@ -790,7 +790,7 @@ class Societe extends CommonObject
 		if (empty($this->status)) $this->status = 0;
 		$this->name = $this->name ?trim($this->name) : trim($this->nom);
 		if (!empty($conf->global->MAIN_FIRST_TO_UPPER)) $this->name = ucwords($this->name);
-		if (!empty($conf->global->MAIN_ALL_TO_UPPER)) $this->name = strtoupper($this->name);
+		if (!empty($conf->global->MAIN_ALL_TO_UPPER)) $this->name = dol_strtoupper($this->name);
 		$this->nom = $this->name; // For backward compatibility
 		if (empty($this->client))      $this->client = 0;
 		if (empty($this->fournisseur)) $this->fournisseur = 0;
@@ -1095,7 +1095,7 @@ class Societe extends CommonObject
 		$now = dol_now();
 
 		if (!empty($conf->global->MAIN_FIRST_TO_UPPER)) $this->name = ucwords($this->name);
-		if (!empty($conf->global->MAIN_ALL_TO_UPPER)) $this->name = strtoupper($this->name);
+		if (!empty($conf->global->MAIN_ALL_TO_UPPER)) $this->name = dol_strtoupper($this->name);
 		// Clean parameters
 		$this->id = $id;
 		$this->entity = ((isset($this->entity) && is_numeric($this->entity)) ? $this->entity : $conf->entity);