diff --git a/src/lib.rs b/src/lib.rs
index 2c3d9c0..c091e90 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,6 +7,7 @@
 #![feature(test)]
 #![feature(error_generic_member_access)]
 #![feature(provide_any)]
+#![feature(lazy_cell)]
 
 extern crate test;