diff --git a/packstack/plugins/nova_300.py b/packstack/plugins/nova_300.py
index 39da6792b..263ae42d8 100644
--- a/packstack/plugins/nova_300.py
+++ b/packstack/plugins/nova_300.py
@@ -350,6 +350,11 @@ def createnetworkmanifest():
     else:
       controller.CONF['CONFIG_NOVA_NETWORK_AUTOASSIGNFLOATINGIP'] = False
 
+    # We need to explicitly set the network size
+    routing_prefix = controller.CONF['CONFIG_NOVA_NETWORK_FIXEDRANGE'].split('/')[1]
+    net_size = 2**(32 - int(routing_prefix))
+    controller.CONF['CONFIG_NOVA_NETWORK_FIXEDSIZE'] = str(net_size)
+
     manifestfile = "%s_nova.pp" % host
     manifestdata = getManifestTemplate("nova_network.pp")
     appendManifestFile(manifestfile, manifestdata)
diff --git a/packstack/puppet/templates/nova_network.pp b/packstack/puppet/templates/nova_network.pp
index 899510a09..b1ff43127 100644
--- a/packstack/puppet/templates/nova_network.pp
+++ b/packstack/puppet/templates/nova_network.pp
@@ -7,6 +7,7 @@ class {"nova::network":
     private_interface => '%(CONFIG_NOVA_NETWORK_PRIVIF)s',
     public_interface => '%(CONFIG_NOVA_NETWORK_PUBIF)s',
     fixed_range => '%(CONFIG_NOVA_NETWORK_FIXEDRANGE)s',
+    network_size => '%(CONFIG_NOVA_NETWORK_FIXEDSIZE)s',
     floating_range => '%(CONFIG_NOVA_NETWORK_FLOATRANGE)s',
     config_overrides => {force_dhcp_release => false}
 }