diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2669ff84..4e341b1f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3265,6 +3265,9 @@ packages:
         # https://github.com/fpco/stackage/issues/3233
         - adjunctions < 4.4
 
+        # https://github.com/fpco/stackage/issues/3234
+        - free < 5
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of