diff --git a/gns3server/controller/node.py b/gns3server/controller/node.py
index 8f63f393..16141a73 100644
--- a/gns3server/controller/node.py
+++ b/gns3server/controller/node.py
@@ -214,6 +214,8 @@ class Node:
         # When updating properties used only on controller we don't need to call the compute
         update_compute = False
 
+        old_json = self.__json__()
+
         compute_properties = None
         # Update node properties with additional elements
         for prop in kwargs:
@@ -227,7 +229,9 @@ class Node:
                 else:
                     setattr(self, prop, kwargs[prop])
 
-        self.project.controller.notification.emit("node.updated", self.__json__())
+        # We send notif only if object has changed
+        if old_json != self.__json__():
+            self.project.controller.notification.emit("node.updated", self.__json__())
         if update_compute:
             data = self._node_data(properties=compute_properties)
             response = yield from self.put(None, data=data)
@@ -392,9 +396,9 @@ class Node:
                 "console_type": self._console_type,
                 "properties": self._properties,
                 "label": self._label,
-                "x": self._x,
-                "y": self._y,
-                "z": self._z,
+                "x": int(self._x),
+                "y": int(self._y),
+                "z": int(self._z),
                 "symbol": self._symbol
             }
         return {
@@ -411,8 +415,8 @@ class Node:
             "properties": self._properties,
             "status": self._status,
             "label": self._label,
-            "x": self._x,
-            "y": self._y,
-            "z": self._z,
+            "x": int(self._x),
+            "y": int(self._y),
+            "z": int(self._z),
             "symbol": self._symbol
         }
diff --git a/gns3server/schemas/node.py b/gns3server/schemas/node.py
index a18da641..5cf2653f 100644
--- a/gns3server/schemas/node.py
+++ b/gns3server/schemas/node.py
@@ -146,15 +146,15 @@ NODE_OBJECT_SCHEMA = {
         },
         "x": {
             "description": "X position of the node",
-            "type": "number"
+            "type": "integer"
         },
         "y": {
             "description": "Y position of the node",
-            "type": "number"
+            "type": "integer"
         },
         "z": {
             "description": "Z position of the node",
-            "type": "number"
+            "type": "integer"
         }
     },
     "additionalProperties": False,
diff --git a/tests/controller/test_node.py b/tests/controller/test_node.py
index 7f1296e4..c431c9fa 100644
--- a/tests/controller/test_node.py
+++ b/tests/controller/test_node.py
@@ -186,16 +186,25 @@ def test_update_properties(node, compute, project, async_run, controller):
     controller._notification.emit.assert_called_with("node.updated", node_notif)
 
 
-def test_update_only_controller(node, compute, project, async_run):
+
+def test_update_only_controller(node, controller, compute, project, async_run):
     """
     When updating property used only on controller we don't need to
     call the compute
     """
     compute.put = AsyncioMagicMock()
+    controller._notification = AsyncioMagicMock()
 
     async_run(node.update(x=42))
     assert not compute.put.called
     assert node.x == 42
+    controller._notification.emit.assert_called_with("node.updated", node.__json__())
+
+    # If nothing change a second notif should not be send
+    controller._notification = AsyncioMagicMock()
+    async_run(node.update(x=42))
+    assert not controller._notification.emit.called
+
 
 
 def test_update_no_changes(node, compute, project, async_run):