diff --git a/nf_core/__main__.py b/nf_core/__main__.py
index 50963b662..bb4c5e708 100644
--- a/nf_core/__main__.py
+++ b/nf_core/__main__.py
@@ -771,7 +771,7 @@ def command_pipelines_schema_lint(directory, schema_file):
     """
     Check that a given pipeline schema is valid.
     """
-    pipelines_schema_lint(directory / schema_file)
+    pipelines_schema_lint(Path(directory, schema_file))
 
 
 # nf-core pipelines schema docs
@@ -818,7 +818,7 @@ def command_pipelines_schema_docs(directory, schema_file, output, format, force,
     """
     Outputs parameter documentation for a pipeline schema.
     """
-    pipelines_schema_docs(directory / schema_file, output, format, force, columns)
+    pipelines_schema_docs(Path(directory, schema_file), output, format, force, columns)
 
 
 # nf-core modules subcommands
diff --git a/tests/test_cli.py b/tests/test_cli.py
index bea0223f0..8df1e210b 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -358,7 +358,7 @@ def test_schema_lint(self, mock_get_schema_path):
             with open("nextflow_schema.json", "w") as f:
                 f.write("{}")
             self.invoke_cli(cmd)
-            mock_get_schema_path.assert_called_with("nextflow_schema.json")
+            mock_get_schema_path.assert_called_with(Path("nextflow_schema.json"))
 
     @mock.patch("nf_core.pipelines.schema.PipelineSchema.get_schema_path")
     def test_schema_lint_filename(self, mock_get_schema_path):
@@ -368,7 +368,7 @@ def test_schema_lint_filename(self, mock_get_schema_path):
             with open("some_other_filename", "w") as f:
                 f.write("{}")
             self.invoke_cli(cmd)
-            mock_get_schema_path.assert_called_with("some_other_filename")
+            mock_get_schema_path.assert_called_with(Path("some_other_filename"))
 
     @mock.patch("nf_core.pipelines.create_logo.create_logo")
     def test_create_logo(self, mock_create_logo):