diff --git a/build-constraints.yaml b/build-constraints.yaml
index b696254d..b3bf264f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3819,9 +3819,6 @@ expected-test-failures:
     - tcp-streams-openssl # https://github.com/didi-FP/tcp-streams/issues/5
     - tmp-postgres # https://github.com/jfischoff/tmp-postgres/issues/1
 
-    # https://github.com/blamario/monoid-subclasses/issues/14
-    - monoid-subclasses
-
     # https://github.com/agrafix/Spock/issues/130
     - reroute