diff --git a/build-constraints.yaml b/build-constraints.yaml
index c2d1f060..3637a3f6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7310,6 +7310,9 @@ packages:
         # Needs GHC 9.4
         - ghc-lib-parser < 9.4.1
 
+        # https://github.com/commercialhaskell/stackage/issues/6670
+        - wai-middleware-delegate < 0.1.3
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of