diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3efd7bde..9e1aa9de 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7850,6 +7850,9 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/6917
         - some < 1.0.5
+
+        # https://github.com/commercialhaskell/stackage/issues/6918
+        - unix-compat < 0.7
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of