--- a/taskcluster/scripts/run-task
+++ b/taskcluster/scripts/run-task
@@ -501,28 +501,23 @@ def main(args):
     # expand ~ in some paths
     if args.vcs_checkout:
         args.vcs_checkout = os.path.expanduser(args.vcs_checkout)
     if args.tools_checkout:
         args.tools_checkout = os.path.expanduser(args.tools_checkout)
     if 'HG_STORE_PATH' in os.environ:
         os.environ['HG_STORE_PATH'] = os.path.expanduser(os.environ['HG_STORE_PATH'])
 
-    if IS_POSIX:
-        if running_as_root:
-            user, group, gids = get_posix_user_group(args.user, args.group)
-            uid = user.pw_uid
-            gid = group.gr_gid
-        else:
-            print('error: run-task must be run as root on POSIX platforms')
-            return 1
-    else:
-        uid = gid = gids = None
+    uid = gid = gids = None
+    if IS_POSIX and running_as_root:
+        user, group, gids = get_posix_user_group(args.user, args.group)
+        uid = user.pw_uid
+        gid = group.gr_gid
 
-    if os.path.exists("/dev/kvm"):
+    if running_as_root and os.path.exists("/dev/kvm"):
         # Ensure kvm permissions for worker, required for Android x86
         st = os.stat("/dev/kvm")
         os.chmod("/dev/kvm", st.st_mode | 0o666)
 
     # Validate caches.
     #
     # Taskgraph should pass in a list of paths that are caches via an
     # environment variable (which we don't want to pass down to child