How to address non-qualifying HSA contribution due to last-minute rule failure

Contributed max amount to my HSA in 2017 based on the last-minute rule (LMR).  However, had only 2mo HDHP coverage in 2018, thus failing the LMR.  Now I need to report majority of 2017 contribution as income.  Do I need to remove this amount from my HSA?  If so, how do I proceed?