diff --git a/lib/client/udp-tracker.js b/lib/client/udp-tracker.js
index b3218bc5..3a3ad42a 100644
--- a/lib/client/udp-tracker.js
+++ b/lib/client/udp-tracker.js
@@ -323,7 +323,7 @@ function toUInt64 (n) {
   if (n > MAX_UINT || typeof n === 'string') {
     const buf = new Uint8Array(8)
     const view = new DataView(buf.buffer)
-    view.setBigUint64(0, n)
+    view.setBigUint64(0, BigInt(n))
     return buf
   }
   return concat([new Uint8Array(4), common.toUInt32(n)])