diff --git a/gns3server/controller/vm.py b/gns3server/controller/vm.py
index c16254d3..80eab9b6 100644
--- a/gns3server/controller/vm.py
+++ b/gns3server/controller/vm.py
@@ -93,6 +93,7 @@ class VM:
         Create the VM on the compute Node
         """
         data = self._vm_data()
+        data["vm_id"] = self._id
         response = yield from self._compute.post("/projects/{}/{}/vms".format(self._project.id, self._vm_type), data=data)
         self._parse_vm_response(response)
 
@@ -109,13 +110,17 @@ class VM:
         :param properties: Emulator specific properties of the VM
 
         """
-        self._name = name
-        self._console = console
-        self._console_type = console_type
-        self._properties = properties
+        if name:
+            self._name = name
+        if console:
+            self._console = console
+        if console_type:
+            self._console_type = console_type
+        if properties != {}:
+            self._properties = properties
 
         data = self._vm_data()
-        response = yield from self._compute.put("/projects/{}/{}/vms".format(self._project.id, self._vm_type), data=data)
+        response = yield from self.put(None, data=data)
         self._parse_vm_response(response)
 
     def _parse_vm_response(self, response):
@@ -125,7 +130,7 @@ class VM:
         for key, value in response.json.items():
             if key == "console":
                 self._console = value
-            elif key in ["console_type", "name", "vm_id"]:
+            elif key in ["console_type", "name", "vm_id", "project_id", "vm_directory", "command_line", "status"]:
                 pass
             else:
                 self._properties[key] = value
@@ -135,7 +140,6 @@ class VM:
         Prepare VM data to send to the remote controller
         """
         data = copy.copy(self._properties)
-        data["vm_id"] = self._id
         data["name"] = self._name
         data["console"] = self._console
         data["console_type"] = self._console_type
@@ -193,17 +197,24 @@ class VM:
         """
         HTTP post on the VM
         """
-        if data:
-            return (yield from self._compute.put("/projects/{}/{}/vms/{}{}".format(self._project.id, self._vm_type, self._id, path), data=data))
+        if path is None:
+            path = "/projects/{}/{}/vms/{}".format(self._project.id, self._vm_type, self._id)
         else:
-            return (yield from self._compute.put("/projects/{}/{}/vms/{}{}".format(self._project.id, self._vm_type, self._id, path)))
+            path = "/projects/{}/{}/vms/{}{}".format(self._project.id, self._vm_type, self._id, path)
+        if data:
+            return (yield from self._compute.put(path, data=data))
+        else:
+            return (yield from self._compute.put(path))
 
     @asyncio.coroutine
     def delete(self, path=None):
         """
         HTTP post on the VM
         """
-        return (yield from self._compute.delete("/projects/{}/{}/vms/{}{}".format(self._project.id, self._vm_type, self._id, path)))
+        if path is None:
+            return (yield from self._compute.delete("/projects/{}/{}/vms/{}".format(self._project.id, self._vm_type, self._id)))
+        else:
+            return (yield from self._compute.delete("/projects/{}/{}/vms/{}{}".format(self._project.id, self._vm_type, self._id, path)))
 
     def __json__(self):
         return {
diff --git a/gns3server/handlers/api/controller/vm_handler.py b/gns3server/handlers/api/controller/vm_handler.py
index c8cdd885..7674a8c3 100644
--- a/gns3server/handlers/api/controller/vm_handler.py
+++ b/gns3server/handlers/api/controller/vm_handler.py
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from ....web.route import Route
-from ....schemas.vm import VM_OBJECT_SCHEMA
+from ....schemas.vm import VM_OBJECT_SCHEMA, VM_UPDATE_SCHEMA
 from ....controller.project import Project
 from ....controller import Controller
 
@@ -56,7 +56,7 @@ class VMHandler:
             400: "Invalid request"
         },
         description="Update a VM instance",
-        input=VM_OBJECT_SCHEMA,
+        input=VM_UPDATE_SCHEMA,
         output=VM_OBJECT_SCHEMA)
     def update(request, response):
         project = Controller.instance().getProject(request.match_info["project_id"])
diff --git a/gns3server/schemas/vm.py b/gns3server/schemas/vm.py
index 89c9c8b5..34f84283 100644
--- a/gns3server/schemas/vm.py
+++ b/gns3server/schemas/vm.py
@@ -111,3 +111,6 @@ VM_OBJECT_SCHEMA = {
     "additionalProperties": False,
     "required": ["name", "vm_type", "compute_id"]
 }
+
+VM_UPDATE_SCHEMA = VM_OBJECT_SCHEMA
+del VM_UPDATE_SCHEMA["required"]
diff --git a/gns3server/schemas/vpcs.py b/gns3server/schemas/vpcs.py
index 90008f35..86cc0204 100644
--- a/gns3server/schemas/vpcs.py
+++ b/gns3server/schemas/vpcs.py
@@ -79,6 +79,10 @@ VPCS_UPDATE_SCHEMA = {
             "description": "Content of the VPCS startup script",
             "type": ["string", "null"]
         },
+        "startup_script_path": {
+            "description": "Path of the VPCS startup script relative to project directory (IGNORED)",
+            "type": ["string", "null"]
+        }
     },
     "additionalProperties": False,
 }
diff --git a/tests/controller/test_vm.py b/tests/controller/test_vm.py
index 2bf39865..61149057 100644
--- a/tests/controller/test_vm.py
+++ b/tests/controller/test_vm.py
@@ -91,15 +91,14 @@ def test_update(vm, compute, project, async_run):
     response.json = {"console": 2048}
     compute.put = AsyncioMagicMock(return_value=response)
 
-    async_run(vm.update(console=2048, console_type="vnc", properties={"startup_script" :"echo test"}, name="demo"))
+    async_run(vm.update(console=2048, console_type="vnc", properties={"startup_script": "echo test"}, name="demo"))
     data = {
         "console": 2048,
         "console_type": "vnc",
-        "vm_id": vm.id,
         "startup_script": "echo test",
         "name": "demo"
     }
-    compute.put.assert_called_with("/projects/{}/vpcs/vms".format(vm.project.id), data=data)
+    compute.put.assert_called_with("/projects/{}/vpcs/vms/{}".format(vm.project.id, vm.id), data=data)
     assert vm._console == 2048
     assert vm._properties == {"startup_script": "echo test"}