diff --git a/gns3server/controller/hypervisor.py b/gns3server/controller/hypervisor.py
index 02d54765..db9c1968 100644
--- a/gns3server/controller/hypervisor.py
+++ b/gns3server/controller/hypervisor.py
@@ -97,5 +97,5 @@ class Hypervisor:
         return body
 
     @asyncio.coroutine
-    def post(self, path, data):
+    def post(self, path, data={}):
         yield from self._httpQuery("POST", path, data)