diff --git a/tests/conftest.py b/tests/conftest.py
index 8b690bfe..7ea22f9a 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -67,12 +67,12 @@ def ocrmypdf_exec():
 
 @pytest.fixture(scope="function")
 def outdir(tmpdir):
-    return Path(tmpdir)
+    return Path(str(tmpdir))
 
 
 @pytest.fixture(scope="function")
 def outpdf(tmpdir):
-    return str(Path(tmpdir) / 'out.pdf')
+    return str(Path(str(tmpdir)) / 'out.pdf')
 
 
 @pytest.fixture(scope="function")
@@ -81,7 +81,7 @@ def no_outpdf(tmpdir):
     output. Unfortunately an assertion failure inside a test fixture produces
     an error rather than a test failure, so no testing is done. It's up to
     the test to confirm that no output file was created."""
-    return str(Path(tmpdir) / 'no_output.pdf')
+    return str(Path(str(tmpdir)) / 'no_output.pdf')
 
 
 @pytest.helpers.register
diff --git a/tests/test_hocrtransform.py b/tests/test_hocrtransform.py
index 75e1fe8f..d792ca76 100644
--- a/tests/test_hocrtransform.py
+++ b/tests/test_hocrtransform.py
@@ -19,7 +19,7 @@ import sys
 
 @pytest.fixture
 def blank_hocr(tmpdir):
-    filename = Path(tmpdir) / "blank.hocr"
+    filename = Path(str(tmpdir)) / "blank.hocr"
     with open(filename, 'w') as f:
         f.write(HOCR_TEMPLATE)
     return filename