diff --git a/wifi/iw.py b/wifi/iw.py
index 647e56c..ae2a8b6 100644
--- a/wifi/iw.py
+++ b/wifi/iw.py
@@ -54,8 +54,8 @@
 
 
 def _scan(interface, scan_args, **kwargs):
-  return subprocess.check_output(['iw', 'dev', interface, 'scan'] + scan_args,
-                                 **kwargs)
+  return subprocess.check_output(
+      ['iw', 'dev', interface, 'scan', '-u'] + scan_args, **kwargs)
 
 
 _WIPHY_RE = re.compile(r'Wiphy (?P<phy>\S+)')