Can anyone tell me why im getting this error;

Not unique table/alias: 'q'

When running the following query;

DELETE q.*, r.* FROM questions AS q, replies AS r WHERE r.id_question = q.question_id AND q.question_id = 55

When were alias's first done be mysql as i've just discovered that my provider are running version 4.0.25

Thanks for any help

Gareth