diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5dfca150..25935073 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -765,7 +765,6 @@ packages:
         - formatting
         - gtk2hs-buildtools
         - happy < 1.21.0 || > 1.21.0 # https://github.com/commercialhaskell/stackage/issues/6294
-        - happy
         - hybrid-vectors
         - indents
         - language-c