diff --git a/beacon_chain/spec/forks.nim b/beacon_chain/spec/forks.nim
index f0c749a2d..7f5150082 100644
--- a/beacon_chain/spec/forks.nim
+++ b/beacon_chain/spec/forks.nim
@@ -280,6 +280,9 @@ type
   ForkyBlobSidecar* =
     deneb.BlobSidecar
 
+  OptSeqForkyBlobSidecar* =
+    Opt[seq[deneb.BlobSidecar]]
+
   ForkyBlobSidecars* =
     deneb.BlobSidecars
 
diff --git a/beacon_chain/validators/beacon_validators.nim b/beacon_chain/validators/beacon_validators.nim
index 323e8ed31..47237c1ef 100644
--- a/beacon_chain/validators/beacon_validators.nim
+++ b/beacon_chain/validators/beacon_validators.nim
@@ -1292,7 +1292,7 @@ proc proposeBlockAux(
           Opt.some(signedBlock.create_blob_sidecars(
             blobsBundle.proofs, blobsBundle.blobs))
         else:
-          Opt.none(seq[BlobSidecar])
+          Opt.none(seq[deneb.BlobSidecar])
       newBlockRef = (
         await node.router.routeSignedBeaconBlock(signedBlock, blobsOpt,
           checkValidator = false)
diff --git a/beacon_chain/validators/message_router.nim b/beacon_chain/validators/message_router.nim
index 3fb0ecb94..df8f303f8 100644
--- a/beacon_chain/validators/message_router.nim
+++ b/beacon_chain/validators/message_router.nim
@@ -84,7 +84,7 @@ template getCurrentBeaconTime(router: MessageRouter): BeaconTime =
 type RouteBlockResult = Result[Opt[BlockRef], string]
 proc routeSignedBeaconBlock*(
     router: ref MessageRouter, blck: ForkySignedBeaconBlock,
-    blobsOpt: Opt[seq[ForkyBlobSidecar]], checkValidator: bool):
+    blobsOpt: OptSeqForkyBlobSidecar, checkValidator: bool):
     Future[RouteBlockResult] {.async: (raises: [CancelledError]).} =
   ## Validate and broadcast beacon block, then add it to the block database
   ## Returns the new Head when block is added successfully to dag, none when
diff --git a/beacon_chain/validators/message_router_mev.nim b/beacon_chain/validators/message_router_mev.nim
index 049b956b4..8324184d7 100644
--- a/beacon_chain/validators/message_router_mev.nim
+++ b/beacon_chain/validators/message_router_mev.nim
@@ -138,7 +138,7 @@ proc unblindAndRouteBlockMEV*(
       Opt.some(signedBlock.create_blob_sidecars(
         blobs_bundle.proofs, blobs_bundle.blobs))
     else:
-      Opt.none(seq[BlobSidecar])
+      Opt.none(seq[deneb.BlobSidecar])
 
   debug "unblindAndRouteBlockMEV: proposing unblinded block",
     blck = shortLog(signedBlock)