diff --git a/gns3server/modules/iou/iou_vm.py b/gns3server/modules/iou/iou_vm.py
index 5f953638..fb050608 100644
--- a/gns3server/modules/iou/iou_vm.py
+++ b/gns3server/modules/iou/iou_vm.py
@@ -848,7 +848,7 @@ class IOUVM(BaseVM):
             with open(config_file) as f:
                 return f.read()
         except OSError as e:
-            raise VPCSError("Can't read configuration file '{}'".format(config_file))
+            raise IOUError("Can't read configuration file '{}'".format(config_file))
 
     @initial_config.setter
     def initial_config(self, initial_config):
@@ -867,7 +867,7 @@ class IOUVM(BaseVM):
                     initial_config = initial_config.replace("%h", self._name)
                     f.write(initial_config)
         except OSError as e:
-            raise VPCSError("Can't write initial configuration file '{}'".format(self.script_file))
+            raise IOUError("Can't write initial configuration file '{}'".format(self.script_file))
 
     @property
     def initial_config_file(self):
diff --git a/tests/api/test_iou.py b/tests/api/test_iou.py
index eaffed13..2676c59b 100644
--- a/tests/api/test_iou.py
+++ b/tests/api/test_iou.py
@@ -49,6 +49,7 @@ def vm(server, project, base_params):
 def initial_config_file(project, vm):
     return os.path.join(project.path, "project-files", "iou", vm["vm_id"], "initial-config.cfg")
 
+
 def test_iou_create(server, project, base_params):
     response = server.post("/projects/{project_id}/iou/vms".format(project_id=project.id), base_params)
     assert response.status == 201
@@ -59,7 +60,7 @@ def test_iou_create(server, project, base_params):
     assert response.json["ethernet_adapters"] == 2
     assert response.json["ram"] == 256
     assert response.json["nvram"] == 128
-    assert response.json["l1_keepalives"] == False
+    assert response.json["l1_keepalives"] is False
 
 
 def test_iou_create_with_params(server, project, base_params):
@@ -80,7 +81,7 @@ def test_iou_create_with_params(server, project, base_params):
     assert response.json["ethernet_adapters"] == 0
     assert response.json["ram"] == 1024
     assert response.json["nvram"] == 512
-    assert response.json["l1_keepalives"] == True
+    assert response.json["l1_keepalives"] is True
     with open(initial_config_file(project, response.json)) as f:
         assert f.read() == params["initial_config"]
 
@@ -95,7 +96,7 @@ def test_iou_get(server, project, vm):
     assert response.json["ethernet_adapters"] == 2
     assert response.json["ram"] == 256
     assert response.json["nvram"] == 128
-    assert response.json["l1_keepalives"] == False
+    assert response.json["l1_keepalives"] is False
 
 
 def test_iou_start(server, vm):
@@ -145,10 +146,11 @@ def test_iou_update(server, vm, tmpdir, free_console_port, project):
     assert response.json["serial_adapters"] == 0
     assert response.json["ram"] == 512
     assert response.json["nvram"] == 2048
-    assert response.json["l1_keepalives"] == True
+    assert response.json["l1_keepalives"] is True
     with open(initial_config_file(project, response.json)) as f:
         assert f.read() == "hostname test"
 
+
 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",
                                                                                                                                                     "lport": 4242,
diff --git a/tests/modules/iou/test_iou_vm.py b/tests/modules/iou/test_iou_vm.py
index 55d80a00..e805c5cc 100644
--- a/tests/modules/iou/test_iou_vm.py
+++ b/tests/modules/iou/test_iou_vm.py
@@ -70,10 +70,11 @@ def test_vm(project, manager):
 
 
 def test_vm_initial_config(project, manager):
-     vm = IOUVM("test", "00010203-0405-0607-0808-0a0b0c0d0e0f", project, manager, initial_config="hostname %h")
-     assert vm.name == "test"
-     assert vm.initial_config == "hostname test"
-     assert vm.id == "00010203-0405-0607-0808-0a0b0c0d0e0f"
+    vm = IOUVM("test", "00010203-0405-0607-0808-0a0b0c0d0e0f", project, manager, initial_config="hostname %h")
+    assert vm.name == "test"
+    assert vm.initial_config == "hostname test"
+    assert vm.id == "00010203-0405-0607-0808-0a0b0c0d0e0f"
+
 
 @patch("gns3server.config.Config.get_section_config", return_value={"iouyap_path": "/bin/test_fake"})
 def test_vm_invalid_iouyap_path(project, manager, loop):