diff --git a/lib/utils/encoding.js b/lib/utils/encoding.js
index 3c0a1bc0..7b6d70ad 100644
--- a/lib/utils/encoding.js
+++ b/lib/utils/encoding.js
@@ -582,7 +582,7 @@ encoding.readVarintBN = function readVarintBN(data, off) {
     case 0xff:
       size = 9;
       assert(off + size <= data.length);
-      value = encoding.readU64(data, off + 1);
+      value = encoding.readU64BN(data, off + 1);
       assert(value.bitLength() > 32);
       return new Varint(size, value);
     default:
@@ -601,7 +601,7 @@ encoding.readVarintBN = function readVarintBN(data, off) {
 encoding.writeVarintBN = function writeVarintBN(dst, num, off) {
   if (num.bitLength() > 32) {
     dst[off] = 0xff;
-    encoding.writeU64(dst, num, off + 1);
+    encoding.writeU64BN(dst, num, off + 1);
     return off + 9;
   }