diff --git a/tools/ctap_test.py b/tools/ctap_test.py
index 7591301..5695f27 100755
--- a/tools/ctap_test.py
+++ b/tools/ctap_test.py
@@ -341,6 +341,7 @@ class Tester:
 
             self.set_cid(cid2)  # send ping on 2nd channel
             self.send_raw("\x81\x00\x63")
+            time.sleep(0.1)
             self.send_raw("\x00")
 
             cmd, r = self.recv_raw()  # busy response