diff --git a/procrunner/__init__.py b/procrunner/__init__.py
index 31659ef..231fecd 100644
--- a/procrunner/__init__.py
+++ b/procrunner/__init__.py
@@ -496,11 +496,13 @@
     command = tuple(_path_resolve(part) for part in command)
     if win32resolve and sys.platform == "win32":
         command = _windows_resolve(command)
+    if working_directory and sys.version_info < (3, 7):
+        working_directory = os.fspath(working_directory)
 
     p = subprocess.Popen(
         command,
         shell=False,
-        cwd=_path_resolve(working_directory),
+        cwd=working_directory,
         env=env,
         stdin=stdin_pipe,
         stdout=subprocess.PIPE,
diff --git a/tests/test_procrunner.py b/tests/test_procrunner.py
index 218053c..3347355 100644
--- a/tests/test_procrunner.py
+++ b/tests/test_procrunner.py
@@ -1,6 +1,7 @@
 import copy
 import mock
 import os
+import pathlib
 import procrunner
 import pytest
 import sys
@@ -87,13 +88,16 @@
         False,
         callback_stdout=mock.sentinel.callback_stdout,
         callback_stderr=mock.sentinel.callback_stderr,
-        working_directory=mock.sentinel.cwd,
+        working_directory=pathlib.Path("somecwd"),
         raise_timeout_exception=True,
     )
 
     assert mock_subprocess.Popen.called
     assert mock_subprocess.Popen.call_args[1]["env"] == os.environ
-    assert mock_subprocess.Popen.call_args[1]["cwd"] == mock.sentinel.cwd
+    assert mock_subprocess.Popen.call_args[1]["cwd"] in (
+        pathlib.Path("somecwd"),
+        "somecwd",
+    )
     mock_streamreader.assert_has_calls(
         [
             mock.call(