MyBB Link Not Complete

Everything works fine except the link that’s added to the WP Post that links to the MyBB thread. This is how it’s added to the post:

http://<forum url>/forums/thread-13919.html

When it should be

http://<forum url>/forums/showthread.php?tid=13919

Is there a way to fix this?

https://wordpress.org/plugins/mybb-cross-poster/