Is my prayer valid even though I mispronounced a word?

When I was reading the Fajr prayer, I was trying to say it quickly because it was late and I was reciting it out loud. When I did sajda (prostration), I think there was too much saliva in my mouth or something so what I said sounded like "subhanarabial'aya" instead of "subhanarabial'ala." It was only one time though. Do you know if my prayer is acceptable? Or have I changed the meaning of the word?