diff --git a/tests/hwsim/hostapd.py b/tests/hwsim/hostapd.py
index b282a9b74..7b6aad567 100644
--- a/tests/hwsim/hostapd.py
+++ b/tests/hwsim/hostapd.py
@@ -46,6 +46,9 @@ class HostapdGlobal:
     def relog(self):
         self.ctrl.request("RELOG")
 
+    def flush(self):
+        self.ctrl.request("FLUSH")
+
 
 class Hostapd:
     def __init__(self, ifname):
diff --git a/tests/hwsim/run-tests.py b/tests/hwsim/run-tests.py
index b95368849..4ae987f86 100755
--- a/tests/hwsim/run-tests.py
+++ b/tests/hwsim/run-tests.py
@@ -42,6 +42,7 @@ def reset_devs(dev, apdev):
 
     try:
         hapd = HostapdGlobal()
+        hapd.flush()
         hapd.remove('wlan3-3')
         hapd.remove('wlan3-2')
         for ap in apdev: