diff --git a/Script/CastorScript.py b/Script/CastorScript.py
index b42d2e339aee4df7893f917c51cc1cd5bc3ec195..47a44a988d1032ae03d482c846be8238a107e336 100644
--- a/Script/CastorScript.py
+++ b/Script/CastorScript.py
@@ -176,7 +176,7 @@ if config.Keytab:
     krb.setCache(config.KrbCache, logger)
     krb_exp = krb.updateToken(config.Keytab, config.KrbUser, logger)
     if not krb_exp:
-        logger.error('could not initialize kerberos ticket: exiting')
+        logger.critical('could not initialize kerberos ticket: exiting')
         sys.exit(1)
 
 # Start the threads