diff --git a/src/test/run-make/rustdoc-extern-method/bar.rs b/src/test/run-make/rustdoc-extern-method/bar.rs
index 672090c13a2..26a05f8490f 100644
--- a/src/test/run-make/rustdoc-extern-method/bar.rs
+++ b/src/test/run-make/rustdoc-extern-method/bar.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(unboxed_closures)]
+
 extern crate foo;
 
 // @has bar/trait.Foo.html //pre "pub trait Foo"
diff --git a/src/test/run-make/rustdoc-extern-method/foo.rs b/src/test/run-make/rustdoc-extern-method/foo.rs
index fc5f03e8bd3..96a7a8378b7 100644
--- a/src/test/run-make/rustdoc-extern-method/foo.rs
+++ b/src/test/run-make/rustdoc-extern-method/foo.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![crate_type="lib"]
+#![feature(unboxed_closures)]
 
 pub trait Foo {
     extern "rust-call" fn foo(&self, _: ()) -> i32;