If you keep getting it wrong long enough, don't worry. The wrong way will become the standard sooner or later. We learned the distinction between compose and comprise by remembering the whole comprises the parts and the parts compose the whole. Therefore, we might say, "Canada comprises 10 provinces and 3 territories" or "10 provinces and 3 territories compose Canada." Thus, using passive voice we should say, "Canada is composed of 10 provinces and 3 territories." Then "Canada is comprised of 10 provinces and 3 territories" should be considered nonstandard usage.
Really? You can spot is comprised of in respected publications such as The New York Times, The New Yorker, and The Atlantic. And once they use it, we all will. In fact, Merriam-Webster considers comprised of a standard phrase. Here is another case of the difficulty in defining and demanding standard English when English standards change.