diff --git a/tests/expectations/tests/libclang-3.9/objc_inheritance.rs b/tests/expectations/tests/libclang-3.9/objc_inheritance.rs
index 59cfacc34c..5f07dbaab1 100644
--- a/tests/expectations/tests/libclang-3.9/objc_inheritance.rs
+++ b/tests/expectations/tests/libclang-3.9/objc_inheritance.rs
@@ -77,6 +77,7 @@ impl Baz {
         Self(unsafe { msg_send!(objc::class!(Baz), alloc) })
     }
 }
+impl IBar for Baz {}
 impl From<Baz> for Bar {
     fn from(child: Baz) -> Bar {
         Bar(child.0)