diff --git a/gns3server/compute/iou/iou_vm.py b/gns3server/compute/iou/iou_vm.py
index d8fb2899b..2322e7723 100644
--- a/gns3server/compute/iou/iou_vm.py
+++ b/gns3server/compute/iou/iou_vm.py
@@ -97,11 +97,11 @@ class IOUVM(BaseNode):
         self._serial_adapters = []
         self.ethernet_adapters = 2  # one adapter = 4 interfaces
         self.serial_adapters = 2  # one adapter = 4 interfaces
-        self._use_default_iou_values = True  # for RAM & NVRAM values
-        self._nvram = 128  # Kilobytes
+        self._use_default_iou_values = False  # for RAM & NVRAM values
+        self._nvram = 256  # Kilobytes
         self._startup_config = ""
         self._private_config = ""
-        self._ram = 256  # Megabytes
+        self._ram = 1024  # Megabytes
         self._application_id = application_id
         self._l1_keepalives = False  # used to overcome the always-up Ethernet interfaces (not supported by all IOSes).
 
diff --git a/tests/compute/iou/test_iou_vm.py b/tests/compute/iou/test_iou_vm.py
index 211b8e3c1..446a6544b 100644
--- a/tests/compute/iou/test_iou_vm.py
+++ b/tests/compute/iou/test_iou_vm.py
@@ -264,7 +264,7 @@ def test_create_netmap_config(vm):
 @pytest.mark.asyncio
 async def test_build_command(vm):
 
-    assert await vm._build_command() == [vm.path, str(vm.application_id)]
+    assert await vm._build_command() == [vm.path, "-n", "256", "-m", "1024", str(vm.application_id)]
 
 
 def test_get_startup_config(vm):