diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4b3b12ec..bded3f49 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4208,6 +4208,7 @@ packages:
         - tasty-ant-xml
         - prettyprinter-combinators
         - htoml-parse
+        - htoml-megaparsec
 
     "Eugene Smolanka <esmolanka@gmail.com> @esmolanka":
         - sexp-grammar