diff --git a/tests/testsuite/doc.rs b/tests/testsuite/doc.rs
index e0e50e9d052..2f2f073f98c 100644
--- a/tests/testsuite/doc.rs
+++ b/tests/testsuite/doc.rs
@@ -568,9 +568,12 @@ fn doc_target() {
         .file(
             "src/lib.rs",
             r#"
-            #![feature(no_core)]
+            #![feature(no_core, lang_items)]
             #![no_core]
 
+            #[lang = "sized"]
+            trait Sized {}
+
             extern {
                 pub static A: u32;
             }