diff --git a/lib.rs b/lib.rs
index d71af53..da193a0 100644
--- a/lib.rs
+++ b/lib.rs
@@ -73,7 +73,6 @@
 #![feature(drop_types_in_const)]
 #![feature(heap_api)]
 #![feature(integer_atomics)]
-#![feature(question_mark)]
 #![feature(never_type)]
 #![feature(thread_local)]
 #![no_std]