diff --git a/cumulus/pallets/parachain-system/src/lib.rs b/cumulus/pallets/parachain-system/src/lib.rs
index 3439227bc5b02..81965a2a31387 100644
--- a/cumulus/pallets/parachain-system/src/lib.rs
+++ b/cumulus/pallets/parachain-system/src/lib.rs
@@ -205,6 +205,7 @@ pub mod pallet {
 		type OnSystemEvent: OnSystemEvent;
 
 		/// Returns the parachain ID we are running with.
+		#[pallet::constant]
 		type SelfParaId: Get<ParaId>;
 
 		/// The place where outbound XCMP messages come from. This is queried in `finalize_block`.