diff --git a/gns3server/modules/virtualbox/__init__.py b/gns3server/modules/virtualbox/__init__.py
index abf64881..dbc0cef2 100644
--- a/gns3server/modules/virtualbox/__init__.py
+++ b/gns3server/modules/virtualbox/__init__.py
@@ -727,7 +727,7 @@ class VirtualBox(IModule):
         """
 
         try:
-            if not user.strip():
+            if not user.strip() or sys.platform.startswith("win") or sys.platform.startswith("darwin"):
                 result = subprocess.check_output(command, stderr=subprocess.STDOUT, timeout=30)
             else:
                 sudo_command = "sudo -i -u " + user.strip() + " " + " ".join(command)
diff --git a/gns3server/modules/virtualbox/virtualbox_vm.py b/gns3server/modules/virtualbox/virtualbox_vm.py
index bb99172a..bb1affc1 100644
--- a/gns3server/modules/virtualbox/virtualbox_vm.py
+++ b/gns3server/modules/virtualbox/virtualbox_vm.py
@@ -553,7 +553,7 @@ class VirtualBoxVM(object):
         log.debug("Execute vboxmanage command: {}".format(command))
         user = self._vbox_user
         try:
-            if not user.strip():
+            if not user.strip() or sys.platform.startswith("win") or sys.platform.startswith("darwin"):
                 result = subprocess.check_output(command, stderr=subprocess.STDOUT, timeout=timeout)
             else:
                 sudo_command = "sudo -i -u " + user.strip() + " " + " ".join(command)