diff --git a/gns3server/ubridge/hypervisor.py b/gns3server/ubridge/hypervisor.py
index 91ed58c4..12a8aff5 100644
--- a/gns3server/ubridge/hypervisor.py
+++ b/gns3server/ubridge/hypervisor.py
@@ -256,5 +256,5 @@ class Hypervisor(UBridgeHypervisor):
         command = [self._path]
         command.extend(["-H", "{}:{}".format(self._host, self._port)])
         if log.getEffectiveLevel() == logging.DEBUG:
-            command.extend(["-d", "2"])
+            command.extend(["-d", "1"])
         return command