diff --git a/src/crypto/browser/crypto.ts b/src/crypto/browser/crypto.ts
index 4cac8f7d..7c07b4d2 100644
--- a/src/crypto/browser/crypto.ts
+++ b/src/crypto/browser/crypto.ts
@@ -19,11 +19,12 @@
 
 import * as base64js from 'base64-js';
 import {CryptoSigner} from '../crypto';
+import {isBrowser} from '../../isbrowser';
 
 // Not all browsers support `TextEncoder`. The following `require` will
 // provide a fast UTF8-only replacement for those browsers that don't support
 // text encoding natively.
-if (typeof TextEncoder === 'undefined') {
+if (isBrowser() && typeof TextEncoder === 'undefined') {
   require('fast-text-encoding');
 }