diff --git a/build-constraints.yaml b/build-constraints.yaml
index d3fb1e84..a2f2086b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8468,6 +8468,9 @@ packages:
         - http2 < 5.2.3
         - http-semantics < 0.1
 
+        # https://github.com/commercialhaskell/stackage/issues/7449
+        - fourmolu < 0.16
+
     # end of Stackage upper bounds
 # end of packages