diff --git a/gns3server/modules/vpcs/__init__.py b/gns3server/modules/vpcs/__init__.py
index dbabf8ca..046eff7f 100644
--- a/gns3server/modules/vpcs/__init__.py
+++ b/gns3server/modules/vpcs/__init__.py
@@ -31,15 +31,16 @@ class VPCS(BaseManager):
 
     def __init__(self):
         super().__init__()
-        self._free_mac_ids = list(range(0, 255))
+        self._free_mac_ids = {}
         self._used_mac_ids = {}
 
     @asyncio.coroutine
     def create_vm(self, *args, **kwargs):
 
         vm = yield from super().create_vm(*args, **kwargs)
+        self._free_mac_ids.setdefault(vm.project.uuid, list(range(0, 255)))
         try:
-            self._used_mac_ids[vm.uuid] = self._free_mac_ids.pop(0)
+            self._used_mac_ids[vm.uuid] = self._free_mac_ids[vm.project.uuid].pop(0)
         except IndexError:
             raise VPCSError("No mac address available")
         return vm
@@ -47,8 +48,9 @@ class VPCS(BaseManager):
     @asyncio.coroutine
     def delete_vm(self, uuid, *args, **kwargs):
 
+        vm = self.get_vm(uuid)
         i = self._used_mac_ids[uuid]
-        self._free_mac_ids.insert(0, i)
+        self._free_mac_ids[vm.project.uuid].insert(0, i)
         del self._used_mac_ids[uuid]
         yield from super().delete_vm(uuid, *args, **kwargs)
 
diff --git a/tests/modules/vpcs/test_vpcs_manager.py b/tests/modules/vpcs/test_vpcs_manager.py
index a239c1c1..7632ef4e 100644
--- a/tests/modules/vpcs/test_vpcs_manager.py
+++ b/tests/modules/vpcs/test_vpcs_manager.py
@@ -44,6 +44,24 @@ def test_get_mac_id(loop, project, port_manager):
     assert vpcs.get_mac_id(vm3_uuid) == 0
 
 
+def test_get_mac_id_multiple_project(loop, port_manager):
+    # Cleanup the VPCS object
+    VPCS._instance = None
+    vpcs = VPCS.instance()
+    vpcs.port_manager = port_manager
+    vm1_uuid = str(uuid.uuid4())
+    vm2_uuid = str(uuid.uuid4())
+    vm3_uuid = str(uuid.uuid4())
+    project1 = ProjectManager.instance().create_project()
+    project2 = ProjectManager.instance().create_project()
+    loop.run_until_complete(vpcs.create_vm("PC 1", project1.uuid, vm1_uuid))
+    loop.run_until_complete(vpcs.create_vm("PC 2", project1.uuid, vm2_uuid))
+    loop.run_until_complete(vpcs.create_vm("PC 2", project2.uuid, vm3_uuid))
+    assert vpcs.get_mac_id(vm1_uuid) == 0
+    assert vpcs.get_mac_id(vm2_uuid) == 1
+    assert vpcs.get_mac_id(vm3_uuid) == 0
+
+
 def test_get_mac_id_no_id_available(loop, project, port_manager):
     # Cleanup the VPCS object
     VPCS._instance = None