diff --git a/src/lib.rs b/src/lib.rs
index 8598a8e7c571..2f2894a59ee2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,7 +2,6 @@
     btree_range,
     collections,
     collections_bound,
-    question_mark,
     rustc_private,
     pub_restricted,
 )]