Can't set a cipher to use with clients linked against GnuTLS

When using a generic binary tarball install where the server is linked against WolfSSL instead of OpenSSL, and the client against GnuTLS, trying to pass a --ssl-cipher option fails with No or insufficient priorities were set:

# mysql --user=user --host=127.0.0.1 --ssl --ssl-cipher=TLS_AES_128_GCM_SHA256

ERROR 2026 (HY000): TLS/SSL error: No or insufficient priorities were set.

I could not really find any useful information on this GnuTLS error message. I assume that this might be about GnuTLS using different cipher naming conventions, maybe?