Header Media Defaulting to Feature Image from Post, Not Page

Hi there, I'm trying to add feature images to display at the top of my pages, and my posts also include feature images. On my blog page, which contains my posts, the header displaying is the most recent featured image from the most recent post, not the feature image I have assigned to the page. How do I resolve this so I only see the image I chose as the header for that page? Thanks!