diff --git a/tempest/api/network/base.py b/tempest/api/network/base.py
index fa6fa33..c6b96b7 100644
--- a/tempest/api/network/base.py
+++ b/tempest/api/network/base.py
@@ -219,7 +219,7 @@
         ext_gw_info = {}
         if external_network_id:
             ext_gw_info['network_id'] = external_network_id
-        if enable_snat:
+        if enable_snat is not None:
             ext_gw_info['enable_snat'] = enable_snat
         body = cls.client.create_router(
             router_name, external_gateway_info=ext_gw_info,