diff --git a/app/models/issue.rb b/app/models/issue.rb
index b45dc966f..7d7db13e1 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -822,6 +822,16 @@ class Issue < ActiveRecord::Base
     !leaf?
   end
 
+  def assignable_trackers
+    trackers = project.trackers
+    if new_record? && parent_issue_id.present?
+      trackers = trackers.reject do |tracker|
+        tracker_id != tracker.id && tracker.disabled_core_fields.include?('parent_issue_id')
+      end
+    end
+    trackers
+  end
+
   # Users the issue can be assigned to
   def assignable_users
     users = project.assignable_users.to_a
diff --git a/app/views/issues/_form.html.erb b/app/views/issues/_form.html.erb
index f9907c345..788a2f38e 100644
--- a/app/views/issues/_form.html.erb
+++ b/app/views/issues/_form.html.erb
@@ -14,7 +14,7 @@
 <% end %>
 
 <% if @issue.safe_attribute? 'tracker_id' %>
-<p><%= f.select :tracker_id, @issue.project.trackers.reject { |t| @issue.new_record? && @issue.parent_issue_id.present? && @issue.tracker_id != t.id && t.disabled_core_fields.include?('parent_issue_id') }.collect {|t| [t.name, t.id]}, {:required => true},
+<p><%= f.select :tracker_id, @issue.assignable_trackers.collect {|t| [t.name, t.id]}, {:required => true},
                 :onchange => "updateIssueFrom('#{escape_javascript update_issue_form_path(@project, @issue)}', this)" %></p>
 <% end %>