Ask HN: What non CompSci courses to take in college? 16 years ago
Accounting/Finance will do you well. Business law, too. It will help a great deal to know when to start a business as a C Corp or an S Corp, how dilution works, how to keep control of your company, when and how to file patents, copyrights, and trademarks, the downside of taking money, how to build cash-flow, profit and loss, and balance sheets, etc.
If you get some business basics in, you lower your chances of getting screwed. Being able to protect your interests and work efforts could end up being your most valuable skill.