diff --git a/gns3server/handlers/api/iou_handler.py b/gns3server/handlers/api/iou_handler.py
index 5e076c4e..edebae1b 100644
--- a/gns3server/handlers/api/iou_handler.py
+++ b/gns3server/handlers/api/iou_handler.py
@@ -117,6 +117,7 @@ class IOUHandler:
         vm.nvram = request.json.get("nvram", vm.nvram)
         vm.l1_keepalives = request.json.get("l1_keepalives", vm.l1_keepalives)
         vm.initial_config = request.json.get("initial_config_content", vm.initial_config)
+        vm.iourc_content = request.json.get("iourc_content", None)
 
         response.json(vm)
 
diff --git a/gns3server/modules/iou/iou_vm.py b/gns3server/modules/iou/iou_vm.py
index 7323b9d7..68a880f6 100644
--- a/gns3server/modules/iou/iou_vm.py
+++ b/gns3server/modules/iou/iou_vm.py
@@ -393,7 +393,7 @@ class IOUVM(BaseVM):
 
         # We can't test this because it's mean distributing a valid licence key
         # in tests or generating one
-        if not sys._called_from_test:
+        if not hasattr(sys, "_called_from_test"):
             try:
                 hostid = (yield from gns3server.utils.asyncio.subprocess_check_output("hostid")).strip()
             except FileNotFoundError as e:
diff --git a/gns3server/schemas/iou.py b/gns3server/schemas/iou.py
index 83f8fd7f..5793488a 100644
--- a/gns3server/schemas/iou.py
+++ b/gns3server/schemas/iou.py
@@ -130,6 +130,10 @@ IOU_UPDATE_SCHEMA = {
         "use_default_iou_values": {
             "description": "Use default IOU values",
             "type": ["boolean", "null"]
+        },
+        "iourc_content": {
+            "description": "Content of the iourc file, if a file exist on servers this variable is ignored. It's mostly for compatibility with < 1.3 releases",
+            "type": ["string", "null"]
         }
     },
     "additionalProperties": False,
diff --git a/tests/handlers/api/test_iou.py b/tests/handlers/api/test_iou.py
index bae3076d..bc0f8da9 100644
--- a/tests/handlers/api/test_iou.py
+++ b/tests/handlers/api/test_iou.py
@@ -147,7 +147,8 @@ def test_iou_update(server, vm, tmpdir, free_console_port, project):
         "serial_adapters": 0,
         "l1_keepalives": True,
         "initial_config_content": "hostname test",
-        "use_default_iou_values": True
+        "use_default_iou_values": True,
+        "iourc_content": "test"
     }
     response = server.put("/projects/{project_id}/iou/vms/{vm_id}".format(project_id=vm["project_id"], vm_id=vm["vm_id"]), params, example=True)
     assert response.status == 200
@@ -163,6 +164,8 @@ def test_iou_update(server, vm, tmpdir, free_console_port, project):
     with open(initial_config_file(project, response.json)) as f:
         assert f.read() == "hostname test"
 
+    assert "iourc" in response.json["iourc_path"]
+
 
 def test_iou_nio_create_udp(server, vm):
     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_udp",