diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 055da19de60..e85bf1dfcad 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -83,7 +83,6 @@
 #![feature(const_fn)]
 #![feature(const_int_ops)]
 #![feature(const_fn_union)]
-#![feature(convert_id)]
 #![feature(custom_attribute)]
 #![feature(doc_cfg)]
 #![feature(doc_spotlight)]
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 2a36b78d79c..b0069f826ee 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -254,7 +254,6 @@
 #![feature(const_fn)]
 #![feature(const_int_ops)]
 #![feature(const_ip)]
-#![feature(convert_id)]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
 #![feature(exact_size_is_empty)]