diff --git a/source/java/org/alfresco/repo/web/scripts/discussion/AbstractDiscussionWebScript.java b/source/java/org/alfresco/repo/web/scripts/discussion/AbstractDiscussionWebScript.java
index 2fe83357ac..99f181d0cd 100644
--- a/source/java/org/alfresco/repo/web/scripts/discussion/AbstractDiscussionWebScript.java
+++ b/source/java/org/alfresco/repo/web/scripts/discussion/AbstractDiscussionWebScript.java
@@ -403,7 +403,24 @@ public abstract class AbstractDiscussionWebScript extends DeclarativeWebScript
        List<Map<String,Object>> items = new ArrayList<Map<String,Object>>();
        for (TopicInfo topic : topics)
        {
-          items.add(renderTopic(topic, site));
+          // ACE-772 fix of incorrect display of topics into "My Discussions" dashlet.
+          // Into "My Discussions" dashlet forum topic will be displayed only if user is a member of that site.
+          if (null == site && null != topic.getShortSiteName())
+          {
+             String currentUser = AuthenticationUtil.getFullyAuthenticatedUser();
+             String siteShortName = topic.getShortSiteName();
+             boolean isSiteMember = siteService.isMember(siteShortName, currentUser);
+
+             if (isSiteMember)
+             {
+                items.add(renderTopic(topic, site));
+             }
+          }
+          // Display all topics on the forum of the site.
+          else
+          {
+             items.add(renderTopic(topic, site));
+          }
        }
        model.put("items", items);