diff --git a/src/test/rustdoc/const-generics/const-impl.rs b/src/test/rustdoc/const-generics/const-impl.rs
index 85ee6d3376b..2d506787b3b 100644
--- a/src/test/rustdoc/const-generics/const-impl.rs
+++ b/src/test/rustdoc/const-generics/const-impl.rs
@@ -4,6 +4,7 @@
 
 #![crate_name = "foo"]
 
+#[derive(PartialEq, Eq)]
 pub enum Order {
     Sorted,
     Unsorted,