diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0103a6f6..071926a9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4396,7 +4396,7 @@ packages:
         - smallcheck-series
 
     "Taisuke Hikawa <23.prime.37@gmail.com> @23prime":
-        - oeis2
+        - oeis2 < 0 # https://github.com/commercialhaskell/stackage/issues/6498
 
     "David Himmelstrup <lemmih@gmail.com> @lemmih":
         - chiphunk