I moved from CA to OR last year, and had the same employer and HSA in both. How do I prevent getting taxed by CA on the contributions I made in OR?

I moved from California to Oregon last year, and had the same employer and HSA in both. I contributed $700 in CA and $1300 in OR, but all $2000 is being taxed in CA. How do I prevent getting taxed by CA on the $1300? I don't see a place on the non-resident portion of the CA state tax return to split the HSA by state.