diff --git a/src/common.rs b/src/common.rs
index 64de8c8bb1838be6eff9cab9b8d8880326a6f4de..0775b8a025f6c237bd804aa78aa222baf3ffebfe 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -44,6 +44,7 @@ pub enum Polarity {
 #[derive(Eq, PartialEq, Ord, PartialOrd, Hash, Copy, Clone, Debug)]
 pub struct Key(u64);
 
+#[derive(Eq, PartialEq, Copy, Clone, Debug)]
 pub enum MainComponentErr {
     NoSuchComponent,
     NonPortTypeParameters,