diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 1e92838a0d7..9883f95ad31 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -491,7 +491,7 @@ if (! defined('NOLOGIN'))
 		}
 
 		// Verification security graphic code
-		if (GETPOST("username", "alpha", 2) && ! empty($conf->global->MAIN_SECURITY_ENABLECAPTCHA))
+		if (GETPOST("username", "alpha", 2) && ! empty($conf->global->MAIN_SECURITY_ENABLECAPTCHA) && ! isset($_SESSION['dol_bypass_antispam']))
 		{
 			$sessionkey = 'dol_antispam_value';
 			$ok=(array_key_exists($sessionkey, $_SESSION) === true && (strtolower($_SESSION[$sessionkey]) == strtolower($_POST['code'])));