diff --git a/nova/virt/xenapi/driver.py b/nova/virt/xenapi/driver.py
index be148a542133..aedc0fd6456d 100644
--- a/nova/virt/xenapi/driver.py
+++ b/nova/virt/xenapi/driver.py
@@ -459,8 +459,7 @@ class XenAPIDriver(driver.ComputeDriver):
                'hypervisor_hostname': host_stats['host_hostname'],
                'cpu_info': jsonutils.dumps(host_stats['cpu_model']),
                'disk_available_least': total_disk_gb - allocated_disk_gb,
-               'supported_instances': jsonutils.dumps(
-                   host_stats['supported_instances']),
+               'supported_instances': host_stats['supported_instances'],
                'pci_passthrough_devices': jsonutils.dumps(
                    host_stats['pci_passthrough_devices']),
                'numa_topology': None}