diff --git a/src/libksupport/src/lib.rs b/src/libksupport/src/lib.rs
index d30a1de..12c8fc3 100644
--- a/src/libksupport/src/lib.rs
+++ b/src/libksupport/src/lib.rs
@@ -1,6 +1,6 @@
 #![no_std]
 #![feature(c_variadic)]
-#![feature(const_btree_new)]
+#![feature(const_btree_len)]
 #![feature(inline_const)]
 #![feature(naked_functions)]
 
diff --git a/src/runtime/src/main.rs b/src/runtime/src/main.rs
index 2abfae0..d624fdd 100644
--- a/src/runtime/src/main.rs
+++ b/src/runtime/src/main.rs
@@ -2,7 +2,7 @@
 #![no_main]
 #![recursion_limit = "1024"] // for futures_util::select!
 #![feature(alloc_error_handler)]
-#![feature(const_btree_new)]
+#![feature(const_btree_len)]
 #![feature(panic_info_message)]
 #![feature(lang_items)]