diff --git a/src/librustdoc/doctest.rs b/src/librustdoc/doctest.rs
index 05f841a7be0..9f35e57df41 100644
--- a/src/librustdoc/doctest.rs
+++ b/src/librustdoc/doctest.rs
@@ -1,7 +1,6 @@
 use rustc_ast as ast;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{ColorConfig, ErrorReported};
-use rustc_feature::UnstableFeatures;
 use rustc_hir as hir;
 use rustc_hir::intravisit;
 use rustc_hir::{HirId, CRATE_HIR_ID};