diff --git a/dm_cli/utils/utils.py b/dm_cli/utils/utils.py
index d7579ad..50fb922 100644
--- a/dm_cli/utils/utils.py
+++ b/dm_cli/utils/utils.py
@@ -126,7 +126,7 @@ def get_root_packages_in_data_sources(path: str) -> dict:
         data_source_names.append(data_source_definition.replace(".json", ""))
     root_packages_in_data_sources = {}
     for data_source in data_source_names:
-        root_packages: list[str] = os.listdir(data_dir / data_source)
+        root_packages: list[str] = os.listdir(os.path.join(data_dir, data_source))
         root_packages_in_data_sources[data_source] = root_packages
     return root_packages_in_data_sources
 
@@ -143,5 +143,5 @@ def validate_entities_in_data_sources(data_source_contents: dict):
     for data_source_name in data_source_contents:
         root_packages = data_source_contents[data_source_name]
         for root_package_name in root_packages:
-            print("Validating entities in: ", f"{data_source_name}/{root_package_name}")
-            dmss_api.validate_existing_entity(f"{data_source_name}/{root_package_name}")
+            print("Validating entities in: ", f"{os.path.join(data_source_name, root_package_name)}")
+            dmss_api.validate_existing_entity(f"{os.path.join(data_source_name, root_package_name)}")