diff --git a/qurator/dinglehopper/tests/test_integ_cli_valid_json.py b/qurator/dinglehopper/tests/test_integ_cli_valid_json.py
index 9d52329..7b35bd7 100644
--- a/qurator/dinglehopper/tests/test_integ_cli_valid_json.py
+++ b/qurator/dinglehopper/tests/test_integ_cli_valid_json.py
@@ -10,7 +10,7 @@ from ..cli import process
 def test_cli_json(tmp_path):
     """Test that the cli/process() yields a loadable JSON report"""
 
-    with working_directory(str(tmp_path)):
+    with working_directory(tmp_path):
         with open("gt.txt", "w") as gtf:
             gtf.write("AAAAA")
         with open("ocr.txt", "w") as ocrf:
@@ -30,7 +30,7 @@ def test_cli_json(tmp_path):
 def test_cli_json_cer_is_infinity(tmp_path):
     """Test that the cli/process() yields a loadable JSON report when CER == inf"""
 
-    with working_directory(str(tmp_path)):
+    with working_directory(tmp_path):
         with open("gt.txt", "w") as gtf:
             gtf.write("")  # Empty to yield CER == inf
         with open("ocr.txt", "w") as ocrf:
diff --git a/qurator/dinglehopper/tests/test_integ_ocrd_cli.py b/qurator/dinglehopper/tests/test_integ_ocrd_cli.py
index 4ac5b55..8aff22d 100644
--- a/qurator/dinglehopper/tests/test_integ_ocrd_cli.py
+++ b/qurator/dinglehopper/tests/test_integ_ocrd_cli.py
@@ -22,10 +22,10 @@ def test_ocrd_cli(tmp_path):
     # Copy test workspace
     test_workspace_dir_source = Path(data_dir) / "actevedef_718448162"
     test_workspace_dir = tmp_path / "test_ocrd_cli"
-    shutil.copytree(str(test_workspace_dir_source), str(test_workspace_dir))
+    shutil.copytree(test_workspace_dir_source, test_workspace_dir)
 
     # Run through the OCR-D interface
-    with working_directory(str(test_workspace_dir)):
+    with working_directory(test_workspace_dir):
         runner = CliRunner()
         args = [
             "-m",
diff --git a/qurator/dinglehopper/tests/test_ocr_files.py b/qurator/dinglehopper/tests/test_ocr_files.py
index fb38c4a..57c3f4a 100644
--- a/qurator/dinglehopper/tests/test_ocr_files.py
+++ b/qurator/dinglehopper/tests/test_ocr_files.py
@@ -176,7 +176,7 @@ def test_text():
 
 
 def test_plain(tmp_path):
-    with working_directory(str(tmp_path)):
+    with working_directory(tmp_path):
         with open("ocr.txt", "w") as ocrf:
             ocrf.write("AAAAB")