diff --git a/cosmos/profiles/bigquery/service_account_keyfile_dict.py b/cosmos/profiles/bigquery/service_account_keyfile_dict.py
index 1c0d1391f..e84587faf 100644
--- a/cosmos/profiles/bigquery/service_account_keyfile_dict.py
+++ b/cosmos/profiles/bigquery/service_account_keyfile_dict.py
@@ -56,10 +56,7 @@ def mock_profile(self) -> dict[str, Any | None]:
         "Generates mock profile. Defaults `threads` to 1."
         parent_mock_profile = super().mock_profile
 
-        return {
-            **parent_mock_profile,
-            "threads": 1,
-        }
+        return {**parent_mock_profile, "threads": 1, "keyfile_json": None}
 
     def transform_keyfile_json(self, keyfile_json: str | dict[str, str]) -> dict[str, str]:
         """
diff --git a/tests/profiles/bigquery/test_bq_service_account_keyfile_dict.py b/tests/profiles/bigquery/test_bq_service_account_keyfile_dict.py
index 8a260ec2f..0647e6800 100644
--- a/tests/profiles/bigquery/test_bq_service_account_keyfile_dict.py
+++ b/tests/profiles/bigquery/test_bq_service_account_keyfile_dict.py
@@ -72,6 +72,22 @@ def test_profile(mock_bigquery_conn_with_dict: Connection):
     assert profile_mapping.profile == expected
 
 
+def test_mock_profile(mock_bigquery_conn_with_dict: Connection):
+    """
+    Tests profile mock for keyfile_json is None. Giving keyfile_json a value will crash dbt ls.
+    """
+    profile_mapping = GoogleCloudServiceAccountDictProfileMapping(mock_bigquery_conn_with_dict, {})
+    expected = {
+        "type": "bigquery",
+        "method": "service-account-json",
+        "project": "mock_value",
+        "dataset": "mock_value",
+        "threads": 1,
+        "keyfile_json": None,
+    }
+    assert profile_mapping.mock_profile == expected
+
+
 def test_profile_env_vars(mock_bigquery_conn_with_dict: Connection):
     """
     Tests that the environment variables get set correctly.