diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
index 5eb5f6cea..7e4d7b3b3 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
@@ -1153,7 +1153,8 @@ def script_unit_test_create(
         "expected_output_json", body
     )
 
-    process_model = get_process_model(process_model_id, process_group_id)
+    process_model_identifier = f"{process_group_id}/{process_model_id}"
+    process_model = get_process_model(process_model_identifier)
     file = SpecFileService.get_files(process_model, process_model.primary_file_name)[0]
     if file is None:
         raise ApiError(