diff --git a/defaults/main.yml b/defaults/main.yml
index 70ef2495..1a3007d7 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -208,7 +208,7 @@ horizon_enable_ha_router: False
 horizon_default_dns_nameservers: []
 
 # Provide list of network types that are available for creation
-horizon_network_provider_types: "{{ neutron_ml2_drivers_type | default(['geneve', 'vlan', 'flat']) }}"
+horizon_network_provider_types: "{{ neutron_ml2_drivers_type | default('geneve,vlan,flat') }}"
 
 # DISALLOW_IFRAME_EMBED can be used to prevent Horizon from being embedded
 # within an iframe. Legacy browsers are still vulnerable to a Cross-Frame
diff --git a/templates/horizon_local_settings.py.j2 b/templates/horizon_local_settings.py.j2
index df8914f3..cf3f4cdc 100644
--- a/templates/horizon_local_settings.py.j2
+++ b/templates/horizon_local_settings.py.j2
@@ -340,7 +340,7 @@ OPENSTACK_NEUTRON_NETWORK = {
     # Set which provider network types are supported. Only the network types
     # in this list will be available to choose from when creating a network.
     # Network types include local, flat, vlan, gre, and vxlan.
-    'supported_provider_types': {{ horizon_network_provider_types | to_json }},
+    'supported_provider_types': {{ horizon_network_provider_types.split(',') | to_json }},
 
     # Set which VNIC types are supported for port binding. Only the VNIC
     # types in this list will be available to choose from when creating a