diff --git a/test/extra/redmine_pm/repository_subversion_test.rb b/test/extra/redmine_pm/repository_subversion_test.rb
index 3feb393ce..3700d3fd9 100644
--- a/test/extra/redmine_pm/repository_subversion_test.rb
+++ b/test/extra/redmine_pm/repository_subversion_test.rb
@@ -167,7 +167,7 @@ class RedminePmTest::RepositorySubversionTest < RedminePmTest::TestCase
 
   def test_write_commands
     Role.find(2).add_permission! :commit_access
-    filename = DateTime.now.strftime("%y%m%d%H%M%S")
+    filename = random_filename
 
     Dir.mktmpdir do |dir|
       assert_success "checkout", svn_url, dir