My bad habit - leaving daughter in bathtub

I had to ask my husband to point out a habit for me, and it took him all of 2 seconds!  I have a tendency to leave my 4.5 year-old in the bathtub unattended while I go off and do something else like clean up after supper, wash dishes, etc.  My excuse was, "If I can hear her, she's still breathing."  And I'd often holler at her if she was too quiet for too long, as a check-in.  This makes my husband EXTREMELY nervous, as I have a tendency to get easily distracted, and could easily forget about her altogether.  Shame on me, I shall be more diligent at bath time.