diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2dabcc85..5050234c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7243,6 +7243,9 @@ packages:
         - microlens-ghc < 0.4.14.0
         - microlens-platform < 0.4.3.0
 
+        # https://github.com/commercialhaskell/stackage/issues/6588
+        - unix-compat < 0.6
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of