diff --git a/beacon_chain/spec/datatypes/altair.nim b/beacon_chain/spec/datatypes/altair.nim
index 5d866ceb4..be86db285 100644
--- a/beacon_chain/spec/datatypes/altair.nim
+++ b/beacon_chain/spec/datatypes/altair.nim
@@ -84,15 +84,6 @@ type
     ## effectively making the cost of clearing the cache higher than the typical
     ## gains
 
-  # https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#syncaggregate
-  SyncAggregate* = object
-    sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
-    sync_committee_signature*: ValidatorSig
-
-  TrustedSyncAggregate* = object
-    sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
-    sync_committee_signature*: TrustedSig
-
   # 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]
@@ -529,8 +520,6 @@ type
     SigVerifiedBeaconBlockBody |
     TrustedBeaconBlockBody
 
-  SomeSyncAggregate* = SyncAggregate | TrustedSyncAggregate
-
   SyncSubcommitteeIndex* = distinct uint8
   IndexInSyncCommittee* = distinct uint16
 
@@ -630,23 +619,6 @@ func shortLog*(v: SyncCommitteeMessage): auto =
     signature: shortLog(v.signature)
   )
 
-func init*(T: type SyncAggregate): SyncAggregate =
-  SyncAggregate(sync_committee_signature: ValidatorSig.infinity)
-
-func num_active_participants*(v: SomeSyncAggregate): int =
-  countOnes(v.sync_committee_bits)
-
-func hasSupermajoritySyncParticipation*(
-    num_active_participants: uint64): bool =
-  const max_active_participants = SYNC_COMMITTEE_SIZE.uint64
-  num_active_participants * 3 >= static(max_active_participants * 2)
-
-func hasSupermajoritySyncParticipation*(v: SomeSyncAggregate): bool =
-  hasSupermajoritySyncParticipation(v.num_active_participants.uint64)
-
-func shortLog*(v: SyncAggregate): auto =
-  $(v.sync_committee_bits)
-
 func shortLog*(v: ContributionAndProof): auto =
   (
     aggregator_index: v.aggregator_index,
@@ -741,7 +713,3 @@ template asTrusted*(
        SigVerifiedSignedBeaconBlock |
        MsgTrustedSignedBeaconBlock): TrustedSignedBeaconBlock =
   isomorphicCast[TrustedSignedBeaconBlock](x)
-
-template asTrusted*(
-    x: SyncAggregate): TrustedSyncAggregate =
-  isomorphicCast[TrustedSyncAggregate](x)
diff --git a/beacon_chain/spec/datatypes/base.nim b/beacon_chain/spec/datatypes/base.nim
index 5dc1708d4..8ac1fdb62 100644
--- a/beacon_chain/spec/datatypes/base.nim
+++ b/beacon_chain/spec/datatypes/base.nim
@@ -281,6 +281,7 @@ type
   SomeProposerSlashing* = ProposerSlashing | TrustedProposerSlashing
   SomeSignedBeaconBlockHeader* = SignedBeaconBlockHeader | TrustedSignedBeaconBlockHeader
   SomeSignedVoluntaryExit* = SignedVoluntaryExit | TrustedSignedVoluntaryExit
+  SomeSyncAggregate* = SyncAggregate | TrustedSyncAggregate
 
   # Legacy database type, see BeaconChainDB
   ImmutableValidatorData* = object
@@ -363,6 +364,15 @@ type
     message*: VoluntaryExit
     signature*: TrustedSig
 
+  # https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#syncaggregate
+  SyncAggregate* = object
+    sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
+    sync_committee_signature*: ValidatorSig
+
+  TrustedSyncAggregate* = object
+    sync_committee_bits*: BitArray[SYNC_COMMITTEE_SIZE]
+    sync_committee_signature*: TrustedSig
+
   # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#beaconblockheader
   BeaconBlockHeader* = object
     slot*: Slot
@@ -806,6 +816,27 @@ func shortLog*(v: SomeSignedVoluntaryExit): auto =
     signature: shortLog(v.signature)
   )
 
+func shortLog*(v: SomeSyncAggregate): auto =
+  $(v.sync_committee_bits)
+
+func init*(T: type SyncAggregate): SyncAggregate =
+  SyncAggregate(sync_committee_signature: ValidatorSig.infinity)
+
+template asTrusted*(
+    x: SyncAggregate): TrustedSyncAggregate =
+  isomorphicCast[TrustedSyncAggregate](x)
+
+func num_active_participants*(v: SomeSyncAggregate): int =
+  countOnes(v.sync_committee_bits)
+
+func hasSupermajoritySyncParticipation*(
+    num_active_participants: uint64): bool =
+  const max_active_participants = SYNC_COMMITTEE_SIZE.uint64
+  num_active_participants * 3 >= static(max_active_participants * 2)
+
+func hasSupermajoritySyncParticipation*(v: SomeSyncAggregate): bool =
+  hasSupermajoritySyncParticipation(v.num_active_participants.uint64)
+
 chronicles.formatIt AttestationData: it.shortLog
 chronicles.formatIt Checkpoint: it.shortLog