diff --git a/bindgen/features.rs b/bindgen/features.rs
index 9871a58ecf..5864b88f42 100644
--- a/bindgen/features.rs
+++ b/bindgen/features.rs
@@ -67,6 +67,7 @@ enum Version {
     Nightly,
 }
 
+#[derive(Debug, PartialEq, Eq, Hash)]
 pub enum InvalidRustTarget {
     TooEarly,
 }