diff --git a/packages/beacon-node/src/chain/opPools/aggregatedAttestationPool.ts b/packages/beacon-node/src/chain/opPools/aggregatedAttestationPool.ts
index e656915552b4..9a3e6622d1ff 100644
--- a/packages/beacon-node/src/chain/opPools/aggregatedAttestationPool.ts
+++ b/packages/beacon-node/src/chain/opPools/aggregatedAttestationPool.ts
@@ -1,5 +1,5 @@
 import {aggregateSignatures, Signature} from "@chainsafe/blst";
-import {BitArray, toHexString} from "@chainsafe/ssz";
+import {BitArray} from "@chainsafe/ssz";
 import {
   ForkName,
   ForkSeq,
diff --git a/packages/beacon-node/src/util/sszBytes.ts b/packages/beacon-node/src/util/sszBytes.ts
index 81821b5eb710..c27df1a0fbf3 100644
--- a/packages/beacon-node/src/util/sszBytes.ts
+++ b/packages/beacon-node/src/util/sszBytes.ts
@@ -202,7 +202,8 @@ export function getAttDataFromSignedAggregateAndProofElectra(data: Uint8Array):
   if (data.length < endIndex + SIGNATURE_SIZE + COMMITTEE_BITS_SIZE) {
     return null;
   }
-  return toBase64(data.subarray(startIndex, endIndex));
+  attDataBuf.set(data.subarray(startIndex, endIndex));
+  return attDataBuf.toString("base64");
 }
 
 /**
@@ -217,7 +218,8 @@ export function getCommitteeBitsFromSignedAggregateAndProofElectra(data: Uint8Ar
     return null;
   }
 
-  return toBase64(data.subarray(startIndex, endIndex));
+  committeeBitsDataBuf.set(data.subarray(startIndex, endIndex));
+  return committeeBitsDataBuf.toString("base64");
 }
 
 /**