diff --git a/polkadot/runtime/common/src/auctions.rs b/polkadot/runtime/common/src/auctions.rs
index f608b5ab06..b73491c32d 100644
--- a/polkadot/runtime/common/src/auctions.rs
+++ b/polkadot/runtime/common/src/auctions.rs
@@ -192,6 +192,7 @@ decl_module! {
 		type Error = Error<T>;
 
 		const EndingPeriod: T::BlockNumber = T::EndingPeriod::get();
+		const SampleLength: T::BlockNumber = T::SampleLength::get();
 		const SlotRangeCount: u32 = SlotRange::SLOT_RANGE_COUNT as u32;
 		const LeasePeriodsPerSlot: u32 = SlotRange::LEASE_PERIODS_PER_SLOT as u32;