diff --git a/htdocs/projet/class/project.class.php b/htdocs/projet/class/project.class.php
index 8aa2515411179..510d7e23e622b 100644
--- a/htdocs/projet/class/project.class.php
+++ b/htdocs/projet/class/project.class.php
@@ -479,6 +479,8 @@ public function update($user, $notrigger = 0)
 			return -3;
 		}
 
+		$this->entity = ((isset($this->entity) && is_numeric($this->entity)) ? $this->entity : $conf->entity);
+
 		if (dol_strlen(trim($this->ref)) > 0) {
 			$this->db->begin();
 
@@ -507,6 +509,7 @@ public function update($user, $notrigger = 0)
 			$sql .= ", accept_booth_suggestions = ".($this->accept_booth_suggestions ? 1 : 0);
 			$sql .= ", price_registration = ".(strcmp($this->price_registration, '') ? price2num($this->price_registration) : "null");
 			$sql .= ", price_booth = ".(strcmp($this->price_booth, '') ? price2num($this->price_booth) : "null");
+			$sql .= ", entity = ".((int) $this->entity);
 			$sql .= " WHERE rowid = ".((int) $this->id);
 
 			dol_syslog(get_class($this)."::update", LOG_DEBUG);