diff --git a/htdocs/process_email_invite.php b/htdocs/process_email_invite.php
index b75323337052ecf029ec1fba4a8cc761b4a3dda1..3e92c579ae83a2cf61f0893b97da4e0713ff1941 100644
--- a/htdocs/process_email_invite.php
+++ b/htdocs/process_email_invite.php
@@ -186,7 +186,7 @@ function captcha_check($email, $from_easy_installer)
     if ($from_easy_installer) {
         global $ei_secret;
         $to_check = htmlspecialchars($_POST["check"]);
-        $check = md5($email. $ei_secret);
+        $check = md5($email . $ei_secret);
         if ($to_check !== $check) {
             $ret = get_easy_installer_message(500);
             respond_with_json($ret);