diff --git a/htdocs/api/class/api_access.class.php b/htdocs/api/class/api_access.class.php
index 4dbd6ac08f3..77c0257d359 100644
--- a/htdocs/api/class/api_access.class.php
+++ b/htdocs/api/class/api_access.class.php
@@ -190,6 +190,7 @@ class DolibarrApiAccess implements iAuthenticate
 							$conf->global->MAIN_NO_INPUT_PRICE_WITH_TAX = 1;
 						}
 						// Set also the global variable $mysoc
+						global $mysoc;
 						$mysoc = $fmysoc;
 
 						// Reload langs