diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 7e671554d1d..15dfc85c8d2 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -598,7 +598,7 @@ if (!defined('NOLOGIN'))
 		if ($test && GETPOST("username", "alpha", 2) && !empty($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'])));
+			$ok = (array_key_exists($sessionkey, $_SESSION) === true && (strtolower($_SESSION[$sessionkey]) === strtolower(GETPOST('code', 'none'))));
 
 			// Check code
 			if (!$ok)
diff --git a/htdocs/public/ticket/create_ticket.php b/htdocs/public/ticket/create_ticket.php
index 46cc1d082e8..6b035a46643 100644
--- a/htdocs/public/ticket/create_ticket.php
+++ b/htdocs/public/ticket/create_ticket.php
@@ -146,7 +146,7 @@ if (empty($reshook) && $action == 'create_ticket' && GETPOST('add', 'alpha')) {
 	// Check Captcha code if is enabled
 	if (!empty($conf->global->MAIN_SECURITY_ENABLECAPTCHA)) {
 		$sessionkey = 'dol_antispam_value';
-		$ok = (array_key_exists($sessionkey, $_SESSION) === true && (strtolower($_SESSION[$sessionkey]) == strtolower($_POST['code'])));
+		$ok = (array_key_exists($sessionkey, $_SESSION) === true && (strtolower($_SESSION[$sessionkey]) === strtolower(GETPOST('code', 'none'))));
 		if (!$ok) {
 			$error++;
 			array_push($object->errors, $langs->trans("ErrorBadValueForCode"));