diff --git a/test/plugin/test_in_tail.rb b/test/plugin/test_in_tail.rb
index ef9d641afa..e7cc9d7a51 100644
--- a/test/plugin/test_in_tail.rb
+++ b/test/plugin/test_in_tail.rb
@@ -998,7 +998,7 @@ def test_rotate_file_with_write_old_and_no_new_file(data)
       assert_equal({"message" => "test8"}, events[3][2])
     end
 
-    def sub_test_rotate_file(config = nil, expect_emits: nil, expect_records: nil, timeout: nil)
+    def sub_test_rotate_file(config = nil, expect_emits: nil, expect_records: nil, timeout: 5)
       file = Fluent::FileWrapper.open("#{TMP_DIR}/tail.txt", "wb")
       file.puts "test1"
       file.puts "test2"
@@ -1016,7 +1016,7 @@ def sub_test_rotate_file(config = nil, expect_emits: nil, expect_records: nil, t
         if Fluent.windows?
           file.close
           FileUtils.mv("#{TMP_DIR}/tail.txt", "#{TMP_DIR}/tail2.txt", force: true)
-          file = File.open("#{TMP_DIR}/tail.txt", "ab")
+          file = Fluent::FileWrapper.open("#{TMP_DIR}/tail2.txt", "ab")
         else
           FileUtils.mv("#{TMP_DIR}/tail.txt", "#{TMP_DIR}/tail2.txt")
         end