diff --git a/src/main.rs b/src/main.rs
index 399a2137ec..05cb7d33f3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -46,6 +46,7 @@
 #![feature(iter_next_chunk)]
 #![feature(sync_unsafe_cell)]
 #![feature(variant_count)]
+#![feature(btree_cursors)]
 #![cfg_attr(not(test), no_std)]
 #![cfg_attr(not(test), no_main)]
 #[macro_use]