diff --git a/materio_user_rules.module b/materio_user_rules.module
index 7a02388d..14c2b65a 100644
--- a/materio_user_rules.module
+++ b/materio_user_rules.module
@@ -16,7 +16,7 @@ function materio_user_rules_user_update(&$edit, $account) {
         $subscriptions_tids[] = $tid;
       }
 
-      $subscriptions_text = implode(' ,', $subscriptions_text_array);
+      $subscriptions_text = implode(', ', $subscriptions_text_array);
 
       $args = array(
         'account' => $account,