diff --git a/build-constraints.yaml b/build-constraints.yaml
index e45249c1..7e614fb1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -958,7 +958,7 @@ packages:
         - monad-extras
         - optparse-simple
         - hpack
-        - stack
+        - stack < 9.9.9
 
     "Michael Sloan <mgsloan@gmail.com> @mgsloan":
         - th-orphans