diff --git a/build-constraints.yaml b/build-constraints.yaml
index ccb444b0..1a4a95fe 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1147,7 +1147,6 @@ packages:
         - iso3166-country-codes
         - iso639
         - murmur-hash
-        - monoidal-containers
 
     "Rob O'Callahan ropoctl@gmail.com":
         - pipes-fastx