diff --git a/beacon_chain/spec/datatypes/altair.nim b/beacon_chain/spec/datatypes/altair.nim
index 117e94019..cedd1d7d4 100644
--- a/beacon_chain/spec/datatypes/altair.nim
+++ b/beacon_chain/spec/datatypes/altair.nim
@@ -232,8 +232,6 @@ type
       ## (used to compute safety threshold)
     current_max_active_participants*: uint64
 
-  InactivityScores* = HashList[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
-
   # https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#beaconstate
   BeaconState* = object
     # Versioning
diff --git a/beacon_chain/spec/datatypes/base.nim b/beacon_chain/spec/datatypes/base.nim
index a7609b7cb..e3d532dc5 100644
--- a/beacon_chain/spec/datatypes/base.nim
+++ b/beacon_chain/spec/datatypes/base.nim
@@ -474,6 +474,8 @@ type
     ## effectively making the cost of clearing the cache higher than the typical
     ## gains
 
+  InactivityScores* = HashList[uint64, Limit VALIDATOR_REGISTRY_LIMIT]
+
   # https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#synccommittee
   SyncCommittee* = object
     pubkeys*: HashArray[Limit SYNC_COMMITTEE_SIZE, ValidatorPubKey]