--- a/src/external/pac_responder.m4
+++ b/src/external/pac_responder.m4
@@ -21,7 +21,8 @@ then
         Kerberos\ 5\ release\ 1.16* | \
         Kerberos\ 5\ release\ 1.17* | \
         Kerberos\ 5\ release\ 1.18* | \
-        Kerberos\ 5\ release\ 1.19*)
+        Kerberos\ 5\ release\ 1.19* | \
+        Kerberos\ 5\ release\ 1.20*)
             krb5_version_ok=yes
             AC_MSG_RESULT([yes])
             ;;
