diff --git a/build-constraints.yaml b/build-constraints.yaml
index 522e2c66..d7476037 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3610,6 +3610,9 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/3792
         - profunctors < 5.3
 
+        # https://github.com/commercialhaskell/stackage/issues/3794
+        - free < 5.1
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of