diff --git a/do.py b/do.py
index c33c3eef..9a9e1730 100644
--- a/do.py
+++ b/do.py
@@ -37,7 +37,7 @@
 
 # supported values - branch name or None
 USE_OPENAPIART_BRANCH = None
-USE_MODELS_BRANCH = port_timestamp
+USE_MODELS_BRANCH = "port-timestamp"
 
 OPENAPIART_REPO = "https://github.com/open-traffic-generator/openapiart.git"
 MODELS_REPO = "https://github.com/open-traffic-generator/models.git"