diff --git a/impacket/krb5/gssapi.py b/impacket/krb5/gssapi.py
index 25167c238..227fe1046 100644
--- a/impacket/krb5/gssapi.py
+++ b/impacket/krb5/gssapi.py
@@ -254,6 +254,9 @@ def GSS_Wrap(self, sessionKey, data, sequenceNumber, direction='init', encrypt=T
 
         cipher = self.cipherType()
 
+        if confounder is None:
+            confounder = b(''.join([rand.choice(string.ascii_letters) for _ in range(8)]))
+
         if padding:
             padStr = padding
             pad = len(padding)