diff --git a/gns3server/modules/adapters/ethernet_adapter.py b/gns3server/modules/adapters/ethernet_adapter.py
index f1a06c63..6a4981a0 100644
--- a/gns3server/modules/adapters/ethernet_adapter.py
+++ b/gns3server/modules/adapters/ethernet_adapter.py
@@ -24,8 +24,8 @@ class EthernetAdapter(Adapter):
     VPCS Ethernet adapter.
     """
 
-    def __init__(self):
-        Adapter.__init__(self, interfaces=1)
+    def __init__(self, interfaces=1):
+        Adapter.__init__(self, interfaces=interfaces)
 
     def __str__(self):
 
diff --git a/gns3server/modules/adapters/serial_adapter.py b/gns3server/modules/adapters/serial_adapter.py
index 5bb00dc1..8986f095 100644
--- a/gns3server/modules/adapters/serial_adapter.py
+++ b/gns3server/modules/adapters/serial_adapter.py
@@ -24,8 +24,8 @@ class SerialAdapter(Adapter):
     VPCS Ethernet adapter.
     """
 
-    def __init__(self):
-        Adapter.__init__(self, interfaces=1)
+    def __init__(self, interfaces=1):
+        Adapter.__init__(self, interfaces=interfaces)
 
     def __str__(self):
 
diff --git a/tests/api/test_iou.py b/tests/api/test_iou.py
index 0c5bfdd1..f22090da 100644
--- a/tests/api/test_iou.py
+++ b/tests/api/test_iou.py
@@ -163,6 +163,17 @@ def test_iou_nio_create_ethernet(server, vm):
     assert response.json["ethernet_device"] == "eth0"
 
 
+def test_iou_nio_create_ethernet_different_port(server, vm):
+    response = server.post("/projects/{project_id}/iou/vms/{vm_id}/adapters/0/ports/3/nio".format(project_id=vm["project_id"], vm_id=vm["vm_id"]), {"type": "nio_generic_ethernet",
+                                                                                                                                                    "ethernet_device": "eth0",
+                                                                                                                                                    },
+                           example=False)
+    assert response.status == 201
+    assert response.route == "/projects/{project_id}/iou/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/nio"
+    assert response.json["type"] == "nio_generic_ethernet"
+    assert response.json["ethernet_device"] == "eth0"
+
+
 def test_iou_nio_create_tap(server, vm):
     with patch("gns3server.modules.base_manager.BaseManager._has_privileged_access", return_value=True):
         response = server.post("/projects/{project_id}/iou/vms/{vm_id}/adapters/1/ports/0/nio".format(project_id=vm["project_id"], vm_id=vm["vm_id"]), {"type": "nio_tap",