diff --git a/build-constraints.yaml b/build-constraints.yaml
index be2e5c4c..4181e77b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -574,6 +574,7 @@ packages:
         - bzip2-clib # needed by bz2
 
     "Sean Hess <seanhess@gmail.com> @seanhess":
+        - atomic-css
         - hyperbole
         - web-view < 0.7.1 # https://github.com/seanhess/hyperbole/issues/109