diff --git a/app/views/welcome/robots.text.erb b/app/views/welcome/robots.text.erb
index 16acc8111..7516fea5d 100644
--- a/app/views/welcome/robots.text.erb
+++ b/app/views/welcome/robots.text.erb
@@ -13,3 +13,5 @@ Disallow: <%= url_for(search_path) %>
 Disallow: <%= url_for(issues_path(:sort => '')) %>
 Disallow: <%= url_for(issues_path(:query_id => '')) %>
 Disallow: <%= url_for(issues_path) %>?*set_filter=
+Disallow: <%= url_for(issues_path(:trailing_slash => true)) %>*.pdf$
+Disallow: <%= url_for(projects_path(:trailing_slash => true)) %>*.pdf$
diff --git a/test/integration/welcome_test.rb b/test/integration/welcome_test.rb
index e28e97ba5..a526a8cec 100644
--- a/test/integration/welcome_test.rb
+++ b/test/integration/welcome_test.rb
@@ -31,5 +31,7 @@ class WelcomeTest < Redmine::IntegrationTest
     assert @response.body.match(%r{^Disallow: /projects/ecookbook/issues\r?$})
     assert @response.body.match(%r{^Disallow: /issues\?sort=\r?$})
     assert @response.body.match(%r{^Disallow: /issues\?\*set_filter=\r?$})
+    assert @response.body.match(%r{^Disallow: /issues/\*\.pdf\$\r?$})
+    assert @response.body.match(%r{^Disallow: /projects/\*\.pdf\$\r?$})
   end
 end