diff --git a/beacon_chain/ssz/merkleization.nim b/beacon_chain/ssz/merkleization.nim
index 509108cca..2472d4d1b 100644
--- a/beacon_chain/ssz/merkleization.nim
+++ b/beacon_chain/ssz/merkleization.nim
@@ -464,7 +464,7 @@ func chunkedHashTreeRootForBasicTypes[T](merkleizer: var SszMerkleizerImpl,
     if remainingValues > 0:
       var lastChunk: array[bytesPerChunk, byte]
       for i in 0 ..< remainingValues:
-        chunk.writeBytesLE(i * sizeof(T), arr[writtenValues + i])
+        lastChunk.writeBytesLE(i * sizeof(T), arr[writtenValues + i])
       merkleizer.addChunk lastChunk
 
   getFinalHash(merkleizer)