diff --git a/lib/common.js b/lib/common.js
index 45ab864..4c18e60 100644
--- a/lib/common.js
+++ b/lib/common.js
@@ -50,7 +50,7 @@ const parseUInt64 = (exports.parseUInt64 = function (parser) {
 
   if (high >>> 21) {
     // using bigint here
-    return bigInt(TWO_TO_POWER_THIRTY_TWO).multiply(high).add(low);
+    return BigInt(high) * BigInt(TWO_TO_POWER_THIRTY_TWO) + BigInt(low);
   }
 
   return high * Math.pow(2, 32) + low;