diff --git a/examples/getST.py b/examples/getST.py
index 8b8c5f4b09..228772354c 100755
--- a/examples/getST.py
+++ b/examples/getST.py
@@ -98,7 +98,7 @@ def doS4U2ProxyWithAdditionalTicket(self, tgt, cipher, oldSessionKey, sessionKey
             logging.info("\tUsing additional ticket %s instead of S4U2Self" % additional_ticket_path)
             ccache = CCache.loadFile(additional_ticket_path)
             principal = ccache.credentials[0].header['server'].prettyPrint()
-            creds = ccache.getCredential(principal)
+            creds = ccache.getCredential(principal.decode())
             TGS = creds.toTGS(principal)
 
             tgs = decoder.decode(TGS['KDC_REP'], asn1Spec=TGS_REP())[0]