diff --git a/build-constraints.yaml b/build-constraints.yaml
index 218ea7e8..4914b627 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3879,7 +3879,7 @@ packages:
         - selda-json
 
     "Luis Pedro Coelho <luis@luispedro.org> @luispedro":
-        - safeio
+        - safeio < 0 # https://github.com/luispedro/safeio/issues/2
         - conduit-algorithms
         - conduit-zstd