In a terminal, run:
export PATH=/usr/local/bin:$PATH
brew link --force openssl
You may have to unlink openssl first if you get a warning: brew unlink openssl
This ensures we're linking the correct openssl for this situation. (and doesn't mess with .profile)
Hat tip to @Olaf's answer and @Felipe's comment. Some people - such as myself - may have some pretty messed up PATH vars.