diff --git a/tests/hwsim/test_ap_vht.py b/tests/hwsim/test_ap_vht.py
index b506ee933..d45062475 100644
--- a/tests/hwsim/test_ap_vht.py
+++ b/tests/hwsim/test_ap_vht.py
@@ -752,10 +752,7 @@ def test_ap_vht80_csa(dev, apdev):
         raise
     finally:
         dev[0].request("DISCONNECT")
-        if hapd:
-            hapd.request("DISABLE")
-        subprocess.call(['iw', 'reg', 'set', '00'])
-        dev[0].flush_scan_cache()
+        clear_regdom(hapd, dev)
 
 def test_ap_vht_csa_vht40(dev, apdev):
     """VHT CSA with VHT40 getting enabled"""