diff --git a/test/test_sbol2_sbol3_direct.py b/test/test_sbol2_sbol3_direct.py
index 51caaa03..a42fa61f 100644
--- a/test/test_sbol2_sbol3_direct.py
+++ b/test/test_sbol2_sbol3_direct.py
@@ -24,14 +24,15 @@ def test_3to2_conversion(self):
         doc2 = convert3to2(doc3, True)
         #report = doc2.validate()
         #self.assertEqual(len(report), 0, f'Validation failed: {report}')
-        with tempfile.NamedTemporaryFile(suffix='.xml') as tmp2:
-            doc2.write(tmp2.name)
-            self.assertFalse(file_diff(tmp2.name, str(TEST_FILES / 'BBa_J23101.xml')))
+        with tempfile.TemporaryDirectory() as tmpdir:
+            tmp2 = Path(tmpdir) / 'doc2.xml'
+            doc2.write(tmp2)
+            self.assertFalse(file_diff(str(tmp2), str(TEST_FILES / 'BBa_J23101.xml')))
             doc3_loop = convert2to3(doc2, use_native_converter=True)
             self.assertEqual(len(doc3_loop.validate()), 0)
-            with tempfile.NamedTemporaryFile(suffix='.nt') as tmp3:
-                doc3_loop.write(tmp3.name)
-                self.assertFalse(file_diff(tmp3.name, str(TEST_FILES / 'BBa_J23101_patched.nt')))
+            tmp3 = Path(tmpdir) / 'doc3_loop.nt'
+            doc3_loop.write(tmp3)
+            self.assertFalse(file_diff(str(tmp3), str(TEST_FILES / 'BBa_J23101_patched.nt')))
 
     def test_2to3_conversion(self):
         """Test ability to convert a simple part from SBOL3 to SBOL2"""
@@ -41,15 +42,16 @@ def test_2to3_conversion(self):
         # Convert to SBOL3 and check contents
         doc3 = convert2to3(doc2, use_native_converter=True)
         self.assertEqual(len(doc3.validate()), 0)
-        with tempfile.NamedTemporaryFile(suffix='.nt') as tmp3:
-            doc3.write(tmp3.name)
-            self.assertFalse(file_diff(tmp3.name, str(TEST_FILES / 'BBa_J23101_patched.nt')))
+        with tempfile.TemporaryDirectory() as tmpdir:
+            tmp3 = Path(tmpdir) / 'doc3.nt'
+            doc3.write(tmp3)
+            self.assertFalse(file_diff(str(tmp3), str(TEST_FILES / 'BBa_J23101_patched.nt')))
             doc2_loop = convert3to2(doc3, True)
             # report = doc2.validate()
             # self.assertEqual(len(report), 0, f'Validation failed: {report}')
-            with tempfile.NamedTemporaryFile(suffix='.xml') as tmp2:
-                doc2_loop.write(tmp2.name)
-                self.assertFalse(file_diff(tmp2.name, str(TEST_FILES / 'BBa_J23101.xml')))
+            tmp2 = Path(tmpdir) / 'doc2_loop.xml'
+            doc2_loop.write(tmp2)
+            self.assertFalse(file_diff(str(tmp2), str(TEST_FILES / 'BBa_J23101.xml')))
 
 
 if __name__ == '__main__':