diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7ea12548..e42fd32c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -475,7 +475,7 @@ packages:
         - coercible-utils < 0 # ghc 8.10
         - hspec-parsec
         - checkers
-        - hnix
+        - hnix <0 # https://github.com/haskell-nix/hnix/issues/651
         - hashing
         - hnix-store-core
         - monadlist