diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0a2d642e..e51df115 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6860,6 +6860,9 @@ packages:
 
       # https://github.com/Gabriel439/Haskell-Pipes-Concurrency-Library/issues/60
       - pipes-concurrency < 2.0.13
+
+      # https://github.com/commercialhaskell/stackage/issues/6322
+      - hashtables < 1.3
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of