diff --git a/beacon_chain/gossip_processing/block_processor.nim b/beacon_chain/gossip_processing/block_processor.nim
index 05df22fea..5f8fc0aa1 100644
--- a/beacon_chain/gossip_processing/block_processor.nim
+++ b/beacon_chain/gossip_processing/block_processor.nim
@@ -218,11 +218,11 @@ proc storeBackfillBlock(
       let data_columns = dataColumnsOpt.get()
       if data_columns.len > 0:
         for i in 0..<data_columns.len:
-          let r = verify_data_column_sidecar_kzg_proofs(data_columns[i])
+          let r = verify_data_column_sidecar_kzg_proofs(data_columns[i][])
           if r.isErr():
             debug "backfill data column validation failed",
               blockRoot = shortLog(signedBlock.root),
-              column_sidecar = shortLog(data_columns[i]),
+              column_sidecar = shortLog(data_columns[i][]),
               blck = shortLog(signedBlock.message),
               signature = shortLog(signedBlock.signature),
               msg = r.error()