diff --git a/src/esxport.py b/src/esxport.py
index 1534aa6..2e147cf 100644
--- a/src/esxport.py
+++ b/src/esxport.py
@@ -185,7 +185,8 @@ def _clean_scroll_ids(self: Self) -> None:
 
     def _extract_headers(self: Self) -> list[str]:
         """Extract CSV headers from the first line of the file."""
-        with Path(f"{self.opts.output_file}.tmp").open() as f:
+        file_name = f"{self.opts.output_file}.tmp"
+        with Path(file_name).open() as f:
             first_line = json.loads(f.readline().strip("\n"))
             return list(first_line.keys())
 
diff --git a/test/click/cli_test.py b/test/click/cli_test.py
index 18c9fed..38f4848 100644
--- a/test/click/cli_test.py
+++ b/test/click/cli_test.py
@@ -116,6 +116,7 @@ def test_query_accepts_dict(self: Self, cli_runner: CliRunner, esxport_obj_with_
                 catch_exceptions=False,
             )
             assert result.exit_code == 0
+            TestExport.rm_csv_export_file(esxport_obj_with_data.opts.output_file)
 
     def test_error_is_rasied_on_invalid_json(self: Self, cli_runner: CliRunner) -> None:
         """Test sort input is in the form field:sort_order."""
diff --git a/test/esxport/_export_test.py b/test/esxport/_export_test.py
index b715c61..56e1ffd 100644
--- a/test/esxport/_export_test.py
+++ b/test/esxport/_export_test.py
@@ -60,10 +60,11 @@ def test_headers_extraction(
         """Check if exception is raised when formatting is invalid."""
         esxport_obj.opts.output_file = f"{inspect.stack()[0].function}.csv"
         test_json = {"age": 2, "bar": "foo", "hello": "world"}
-        with Path(f"{esxport_obj.opts.output_file}.tmp").open(mode="w", encoding="utf-8") as tmp_file:
+        temp_file = f"{esxport_obj.opts.output_file}.tmp"
+        with Path(temp_file).open("w") as tmp_file:
             tmp_file.write(json.dumps(test_json))
             tmp_file.write("\n")
-        assert Path(f"{esxport_obj.opts.output_file}.tmp").exists() is True
+        assert Path(temp_file).exists() is True
         keys = list(test_json.keys())
         assert esxport_obj._extract_headers() == keys
         TestExport.rm_export_file(f"{inspect.stack()[0].function}.csv")