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-rw-r--r--src/liballoc/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 94379afc2bd..ddfa6797a57 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -116,7 +116,7 @@
 #![feature(unsize)]
 #![feature(unsized_locals)]
 #![feature(allocator_internals)]
-#![feature(on_unimplemented)]
+#![cfg_attr(bootstrap, feature(on_unimplemented))]
 #![feature(rustc_const_unstable)]
 #![feature(slice_partition_dedup)]
 #![feature(maybe_uninit_extra, maybe_uninit_slice)]