diff --git a/packages/auth-browser/src/lib/chains/eth.ts b/packages/auth-browser/src/lib/chains/eth.ts
index 8ca7da797b..3e66c6f79f 100644
--- a/packages/auth-browser/src/lib/chains/eth.ts
+++ b/packages/auth-browser/src/lib/chains/eth.ts
@@ -42,10 +42,14 @@ import {
 } from '@lit-protocol/misc';
 import { getStorageItem } from '@lit-protocol/misc-browser';
 
-if (typeof global.Buffer === 'undefined') {
+if (global && typeof global.Buffer === 'undefined') {
   global.Buffer = BufferPolyfill;
 }
 
+if (globalThis && typeof globalThis.Buffer === 'undefined') {
+  globalThis.Buffer = BufferPolyfill;
+}
+
 // log("naclUtil:", naclUtil);
 // log("nacl:", nacl);