diff --git a/src/lib.rs b/src/lib.rs
index 3674717..deb9313 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,6 +10,7 @@
 
 #![deny(missing_docs)]
 
+pub extern crate crossbeam;
 pub extern crate nalgebra as na;
 #[cfg(feature = "dim2")]
 pub extern crate ncollide2d as ncollide;