diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 80a9c3811cf6..26bf4b569ff4 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -15,6 +15,7 @@
 #![feature(never_type)]
 #![feature(once_cell)]
 #![feature(type_ascription)]
+#![feature(split_inclusive)]
 #![recursion_limit = "256"]
 
 #[macro_use]