diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4e34a42b..fc74b10b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4496,6 +4496,7 @@ packages:
         - egison-pattern-src-th-mode
 
     "Travis Cardwell <travis.cardwell@extrema.is> @TravisCardwell":
+        - horizontal-rule
         - literatex
         - ttc