diff --git a/includes/notifications_subscription.class.inc b/includes/notifications_subscription.class.inc
index a0acfa5..666487e 100644
--- a/includes/notifications_subscription.class.inc
+++ b/includes/notifications_subscription.class.inc
@@ -875,7 +875,7 @@ class Notifications_Subscription extends Messaging_Object {
     }
     switch (TRUE) {
       case $format & self::FORMAT_INLINE:
-        return implode(',', $items);
+        return implode(', ', $items);
       case $format & self::FORMAT_LIST:
         return theme('item_list', $items);
       case $format & self::FORMAT_TABLE: