diff --git a/fastkml/kml.py b/fastkml/kml.py
index 4ade8ce2..b3db3621 100644
--- a/fastkml/kml.py
+++ b/fastkml/kml.py
@@ -27,7 +27,6 @@
 """
 
 import logging
-import os
 from pathlib import Path
 from typing import IO
 from typing import Any
@@ -257,7 +256,7 @@ def write(
         Write KML to a file
         Args:
         ----
-            file_name: The file name where to save the file.
+            file_path: The file name where to save the file.
                 Can be any string value
             prettyprint : bool, default=True
                 Whether to pretty print the XML.
@@ -288,9 +287,9 @@ def write(
 
         if file_path.suffix == ".kmz":
             with zipfile.ZipFile(file_path, 'w', zipfile.ZIP_DEFLATED) as kmz:
-                kmz.write(file_path, arcname=os.path.basename(file_path))
+                kmz.writestr('doc.kml', tree)
         else:
-            with open(file_path, "w") as file:
+            with open(file_path, "w",  encoding="UTF-8") as file:
                 file.write(tree)
 
 
diff --git a/tests/kml_test.py b/tests/kml_test.py
index e5daeea7..f449a360 100644
--- a/tests/kml_test.py
+++ b/tests/kml_test.py
@@ -209,7 +209,7 @@ def test_write_kml_file(self) -> None:
           )
 
         file_path = KMLFILEDIR / "output.kml"
-        kml.KML.write(doc, file_path=file_path, prettyprint=True, xml_declaration=True)
+        doc.write(file_path=file_path, prettyprint=True, xml_declaration=True)
 
         assert file_path.is_file(), "KML file was not created."
 
@@ -236,7 +236,7 @@ def test_write_kmz_file(self) -> None:
 
         file_path = KMLFILEDIR / "output.kmz"
 
-        kml.KML.write(doc, file_path=file_path, prettyprint=True, xml_declaration=True)
+        doc.write(file_path=file_path, prettyprint=True, xml_declaration=True)
 
         assert file_path.is_file(), "KMZ file was not created."
 
diff --git a/tests/ogc_conformance/data/kml/output.kmz b/tests/ogc_conformance/data/kml/output.kmz
index a71b613e..bc737f2d 100644
Binary files a/tests/ogc_conformance/data/kml/output.kmz and b/tests/ogc_conformance/data/kml/output.kmz differ