1 files changed, 2 insertions, 2 deletions
diff --git a/stockton-levels/src/features.rs b/stockton-levels/src/features.rs
index dea1d15..f9e6455 100644
--- a/stockton-levels/src/features.rs
+++ b/stockton-levels/src/features.rs
@@ -32,5 +32,5 @@
 use crate::coords::CoordSystem;
 use crate::traits::*;
 
-pub trait MinBSPFeatures<S: CoordSystem>: HasBSPTree<S> {}
-impl<T, S: CoordSystem> MinBSPFeatures<S> for T where T: HasBSPTree<S> {}
+pub trait MinBSPFeatures<S: CoordSystem>: HasBSPTree<S> + Send + Sync {}
+impl<T, S: CoordSystem> MinBSPFeatures<S> for T where T: HasBSPTree<S> + Send + Sync {}