diff --git a/src/r3_core/src/lib.rs b/src/r3_core/src/lib.rs
index eb1cc196e7..f5f73c178c 100644
--- a/src/r3_core/src/lib.rs
+++ b/src/r3_core/src/lib.rs
@@ -1,5 +1,6 @@
 #![feature(const_fn_floating_point_arithmetic)]
 #![feature(const_nonnull_slice_from_raw_parts)]
+#![feature(const_maybe_uninit_uninit_array)]
 #![feature(const_maybe_uninit_assume_init)]
 #![feature(const_maybe_uninit_as_mut_ptr)]
 #![feature(nonnull_slice_from_raw_parts)]
diff --git a/src/r3_kernel/src/lib.rs b/src/r3_kernel/src/lib.rs
index f27ad1974a..933b7dca09 100644
--- a/src/r3_kernel/src/lib.rs
+++ b/src/r3_kernel/src/lib.rs
@@ -1,3 +1,4 @@
+#![feature(const_maybe_uninit_uninit_array)]
 #![feature(const_maybe_uninit_assume_init)]
 #![feature(const_slice_from_raw_parts)]
 #![feature(maybe_uninit_uninit_array)]