diff --git a/gns3server/controller/topology.py b/gns3server/controller/topology.py
index 7456a1bc..7842c536 100644
--- a/gns3server/controller/topology.py
+++ b/gns3server/controller/topology.py
@@ -341,6 +341,8 @@ def _convert_1_3_later(topo, topo_path):
 
         node_id_to_node_uuid[old_node["id"]] = node["node_id"]
         for port in old_node.get("ports", []):
+            if node["node_type"] in ("ethernet_hub", "ethernet_switch"):
+                port["port_number"] -= 1
             ports[port["id"]] = port
         new_topo["topology"]["nodes"].append(node)
 
diff --git a/tests/topologies/1_5_builtins/after/builtins.gns3 b/tests/topologies/1_5_builtins/after/builtins.gns3
index 643f69b2..581556da 100644
--- a/tests/topologies/1_5_builtins/after/builtins.gns3
+++ b/tests/topologies/1_5_builtins/after/builtins.gns3
@@ -14,7 +14,23 @@
             }
         ],
         "drawings": [],
-        "links": [],
+        "links": [
+          {
+            "link_id": "ANYUUID",
+            "nodes": [
+              {
+                "port_number": 1,
+                "node_id": "ANYUUID",
+                "adapter_number": 0
+              },
+              {
+                "port_number": 1,
+                "node_id": "ANYUUID",
+                "adapter_number": 0
+              }
+            ]
+          }
+        ],
         "nodes": [
             {
                 "compute_id": "local",
diff --git a/tests/topologies/1_5_builtins/before/builtins.gns3 b/tests/topologies/1_5_builtins/before/builtins.gns3
index 24eac2a2..6f879f73 100644
--- a/tests/topologies/1_5_builtins/before/builtins.gns3
+++ b/tests/topologies/1_5_builtins/before/builtins.gns3
@@ -4,6 +4,16 @@
     "project_id": "644e3892-4a50-4457-9601-2234d4842169",
     "revision": 4,
     "topology": {
+        "links": [
+            {
+                "description": "",
+                "destination_node_id": 3,
+                "destination_port_id": 10,
+                "id": 1,
+                "source_node_id": 2,
+                "source_port_id": 2
+            }
+        ],
         "nodes": [
             {
                 "description": "ATM switch",