diff --git a/src/common.rs b/src/common.rs
index 2a6d8069b10b66f9aa9353131cae7d157c718c30..537487d427612edb0a78dec1f1462bfd040f1db5 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -52,7 +52,7 @@ pub struct ComponentId(Id); // PUB because it can be returned by errors
 /// Identifier of a port in a session
 #[derive(Copy, Clone, Eq, PartialEq, Ord, Hash, PartialOrd, serde::Serialize, serde::Deserialize)]
 #[repr(transparent)]
-pub struct PortId(Id);
+pub struct PortId(pub(crate) Id);
 
 /// A safely aliasable heap-allocated payload of message bytes
 #[derive(Default, Eq, PartialEq, Clone, Ord, PartialOrd)]