Don't use LocalPath.strpath
diff --git a/tests/requirements_txt_fixer_test.py b/tests/requirements_txt_fixer_test.py
index fae5a72..f4f679d 100644
--- a/tests/requirements_txt_fixer_test.py
+++ b/tests/requirements_txt_fixer_test.py
@@ -93,7 +93,7 @@
     path = tmpdir.join('file.txt')
     path.write_binary(input_s)
 
-    output_retval = main([path.strpath])
+    output_retval = main([str(path)])
 
     assert path.read_binary() == output
     assert output_retval == expected_retval