1 files changed, 1 insertions, 1 deletions
diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index 0449fa215a..0fa7b4c5cd 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -729,7 +729,7 @@ module Test
           return result
         ensure
           if file = @options[:timetable_data]
-            open(file, 'w'){|f|
+            File.open(file, 'w'){|f|
               @records.each{|(worker, suite), (st, ed)|
                 f.puts '[' + [worker.dump, suite.dump, st.to_f * 1_000, ed.to_f * 1_000].join(", ") + '],'
               }