diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4c928f79..4cb621d1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3394,6 +3394,10 @@ packages:
 
         # https://github.com/fpco/stackage/issues/3292
         - pretty-show < 1.7
+
+        # https://github.com/fpco/stackage/issues/3294
+        # https://github.com/commercialhaskell/stack/issues/3871
+        - hpack < 0.27.0
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of