Use on site with SSL

Hello,

I am using your plugin on a site that we just added an SSL certificate to. I’ve been able to resolve all other non-HTTPS image conflicts except for the one that I believe is coming from your plugin:

https://maps.google.com/mapfiles/ms/icons/red-dot.png

I’ve already used WP Engines post-processing option (https://wpengine.com/support/html-post-processing/) with the Google map domain:

#https://maps\.google\.com/# => https://maps.google.com/

However, this is not doing anything. Do you know if there’s a way to force the HTTPS on this image path?