diff --git a/osm_mon/collector/vnf_collectors/openstack.py b/osm_mon/collector/vnf_collectors/openstack.py
index df0424b..7de93ec 100644
--- a/osm_mon/collector/vnf_collectors/openstack.py
+++ b/osm_mon/collector/vnf_collectors/openstack.py
@@ -142,15 +142,15 @@
 
     def _get_backend(self, vim_account: dict):
         try:
-            ceilometer = CeilometerBackend(vim_account)
-            ceilometer.client.capabilities.get()
-            log.info("Using ceilometer backend to collect metric")
-            return ceilometer
-        except (HTTPException, EndpointNotFound):
             gnocchi = GnocchiBackend(vim_account)
             gnocchi.client.metric.list(limit=1)
             log.info("Using gnocchi backend to collect metric")
             return gnocchi
+        except (HTTPException, EndpointNotFound):
+            ceilometer = CeilometerBackend(vim_account)
+            ceilometer.client.capabilities.get()
+            log.info("Using ceilometer backend to collect metric")
+            return ceilometer
 
     def _get_metric_type(self, metric_name: str, interface_name: str) -> MetricType:
         if metric_name not in INTERFACE_METRICS: