diff --git a/slack_sdk/scim/v1/internal_utils.py b/slack_sdk/scim/v1/internal_utils.py
index cbb90dd72..8e658aac6 100644
--- a/slack_sdk/scim/v1/internal_utils.py
+++ b/slack_sdk/scim/v1/internal_utils.py
@@ -108,7 +108,7 @@ def _convert_dict_keys(
                             )
                         result_dict[new_key].append(new_element)
                 else:
-                    result_dict[new_key].append(_create_copy(original_value))
+                    result_dict[new_key].append(_create_copy(element))
         else:
             result_dict[new_key] = _create_copy(original_value)
     return result_dict
diff --git a/tests/slack_sdk/scim/test_internals.py b/tests/slack_sdk/scim/test_internals.py
index d0a27b17b..d1ddca1bb 100644
--- a/tests/slack_sdk/scim/test_internals.py
+++ b/tests/slack_sdk/scim/test_internals.py
@@ -16,3 +16,9 @@ def test_snake_cased(self):
         result = _to_snake_cased(json.loads(response_body))
         self.assertEqual(result["start_index"], 1)
         self.assertIsNotNone(result["resources"][0]["id"])
+
+    def test_snake_cased_list_of_strings(self):
+        body = {"schemas": ["urn:a", "urn:b"], "emails": [{"primaryValue": "x"}]}
+        result = _to_snake_cased(body)
+        self.assertEqual(result["schemas"], ["urn:a", "urn:b"])
+        self.assertEqual(result["emails"], [{"primary_value": "x"}])