diff --git a/build-constraints.yaml b/build-constraints.yaml
index a9cdbf9f..2ffbafca 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -99,7 +99,7 @@ packages:
         - random-source
         - shelly
         - smtLib
-        - stack
+        - stack < 9.9.9
         - stackage
         # Temporary block while system-filepath issues worked out
         # - stackage-curator