Index: app/models/issue.rb
===================================================================
--- app/models/issue.rb	(revision 14622)
+++ app/models/issue.rb	(working copy)
@@ -879,12 +879,14 @@
     if assigned_to
       notified += (assigned_to.is_a?(Group) ? assigned_to.users : [assigned_to])
     end
-    if assigned_to_was
-      notified += (assigned_to_was.is_a?(Group) ? assigned_to_was.users : [assigned_to_was])
+    unless self.is_private?
+      if assigned_to_was
+        notified += (assigned_to_was.is_a?(Group) ? assigned_to_was.users : [assigned_to_was])
+      end
+      notified = notified.select {|u| u.active? && u.notify_about?(self)}
+
+      notified += project.notified_users
     end
-    notified = notified.select {|u| u.active? && u.notify_about?(self)}
-
-    notified += project.notified_users
     notified.uniq!
     # Remove users that can not view the issue
     notified.reject! {|user| !visible?(user)}