diff --git a/lib/rsa-extra.js b/lib/rsa-extra.js
index 2ba7dd1..38a3e77 100644
--- a/lib/rsa-extra.js
+++ b/lib/rsa-extra.js
@@ -7,7 +7,13 @@ function _bigIntToBase64Url(fbin) {
     // Invalid hex string
     hex = '0' + hex;
   }
-  var buf = Buffer.from(hex, 'hex');
+  var buf;
+  // See https://github.com/Daplie/rsa-compat.js/issues/9
+  try {
+    buf = Buffer.from(hex, 'hex');
+  } catch(e) {
+    buf = new Buffer(hex, 'hex');
+  }
   var b64 = buf.toString('base64');
   var b64Url = b64.replace(/[+]/g, "-").replace(/\//g, "_").replace(/=/g,"");