diff --git a/build-constraints.yaml b/build-constraints.yaml
index d21d0b67..fd690f12 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4768,7 +4768,7 @@ packages:
 
     "Brandon Chinn <brandonchinn178@gmail.com> @brandonchinn178":
         - aeson-schemas
-        - fourmolu
+        - fourmolu < 0.20 # https://github.com/commercialhaskell/stackage/issues/8047
         - github-rest
         - graphql-client
         - hpc-lcov