diff --git a/app/views/open_source_projects/_show_memo.html.erb b/app/views/open_source_projects/_show_memo.html.erb
index f7027c7f2..63de42132 100644
--- a/app/views/open_source_projects/_show_memo.html.erb
+++ b/app/views/open_source_projects/_show_memo.html.erb
@@ -14,7 +14,12 @@
 			<td>
 			<table width="630px" border="0">
 				<tr>
-					<td valign="top" width="500px" class="<%= topic.sticky ? 'sticky' : '' %> <%= topic.locked? ? 'locked' : '' %>"><%= link_to h(topic.subject), open_source_project_relative_memo_path(open_source_project, topic) %></td>
+					<td valign="top" width="500px" class="<%= topic.sticky ? 'sticky' : '' %> <%= topic.locked? ? 'locked' : '' %>">
+						<% if topic.url.nil? || topic.url == '' %>
+						<%= link_to h(topic.subject), open_source_project_relative_memo_path(open_source_project, topic) %>
+						<% else %>
+						<%= link_to h(topic.subject), topic.url %>
+						<% end %></td>
 					<td align="right" rowspan="3">
 					<table class="borad-count">
 						<tr>
diff --git a/app/views/open_source_projects/_show_topics.html.erb b/app/views/open_source_projects/_show_topics.html.erb
index c6df07c8e..c58f0ce22 100644
--- a/app/views/open_source_projects/_show_topics.html.erb
+++ b/app/views/open_source_projects/_show_topics.html.erb
@@ -366,7 +366,7 @@
 			<td>
 			<table width="630px" border="0">
 				<tr>
-					<td valign="top" width="500px" class="<%= topic.sticky ? 'sticky' : '' %> <%= topic.locked? ? 'locked' : '' %>"><%= link_to h(topic.subject), open_source_project_relative_memo_path(open_source_project, topic) %></td>
+					<td valign="top" width="500px" class="<%= topic.sticky ? 'sticky' : '' %> <%= topic.locked? ? 'locked' : '' %>"><%= link_to h(topic.subject), topic.url %></td>
 					<td align="right" rowspan="3">
 					<table class="borad-count">
 						<tr>