diff --git a/test/functional/wiki_controller_test.rb b/test/functional/wiki_controller_test.rb
index e3ac6cb4e..70b892ba5 100644
--- a/test/functional/wiki_controller_test.rb
+++ b/test/functional/wiki_controller_test.rb
@@ -467,6 +467,7 @@ class WikiControllerTest < Redmine::ControllerTest
   end
 
   def test_update_with_deleted_attachment_ids
+    set_tmp_attachments_directory
     @request.session[:user_id] = 2
     page = WikiPage.find(4)
     attachment = page.attachments.first
@@ -486,6 +487,7 @@ class WikiControllerTest < Redmine::ControllerTest
   end
 
   def test_update_with_deleted_attachment_ids_and_failure_should_preserve_selected_attachments
+    set_tmp_attachments_directory
     @request.session[:user_id] = 2
     page = WikiPage.find(4)
     attachment = page.attachments.first