diff --git a/addons/recaptcha/recaptcha.class.php b/addons/recaptcha/recaptcha.class.php
index 7c12cc83f..aa7bf40d9 100644
--- a/addons/recaptcha/recaptcha.class.php
+++ b/addons/recaptcha/recaptcha.class.php
@@ -58,7 +58,6 @@ class reCAPTCHA
 	
 	public function __toString()
 	{
-		self::$instances_inserted++;
-		return '<div id="recaptcha-instance-%d" class="g-recaptcha"></div>';
+		return sprintf('<div id="recaptcha-instance-%d" class="g-recaptcha"></div>', self::$instances_inserted++);
 	}
 }