diff --git a/src/browser/decrypt-with-key-async.js b/src/browser/decrypt-with-key-async.js
index 3e328c5..3ae82eb 100644
--- a/src/browser/decrypt-with-key-async.js
+++ b/src/browser/decrypt-with-key-async.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import browser from 'bowser';
 import { toBase64, base64ToBuffer } from './utils/crypto-utils';
 import CryptoWorkerApi from './crypto-worker-api';
diff --git a/src/browser/decrypt-with-key.js b/src/browser/decrypt-with-key.js
index ad36611..f9599ba 100644
--- a/src/browser/decrypt-with-key.js
+++ b/src/browser/decrypt-with-key.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import VirgilCrypto from './utils/crypto-module';
 import { bufferToByteArray, byteArrayToBuffer } from './utils/crypto-utils';
 import { throwVirgilError } from './utils/crypto-errors';
diff --git a/src/browser/encrypt-async.js b/src/browser/encrypt-async.js
index bedd0ca..744ea5c 100644
--- a/src/browser/encrypt-async.js
+++ b/src/browser/encrypt-async.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import { encryptWithPasswordAsync } from './encrypt-with-password-async';
 import { encryptWithKeyAsync } from './encrypt-with-key-async';
 import { encryptWithKeyMultiRecipientsAsync } from './encrypt-with-key-multi-recipients-async';
diff --git a/src/browser/encrypt.js b/src/browser/encrypt.js
index 9fae4a1..0922a4f 100644
--- a/src/browser/encrypt.js
+++ b/src/browser/encrypt.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import { encryptWithPassword } from './encrypt-with-password';
 import { encryptWithKey } from './encrypt-with-key';
 import { encryptWithKeyMultiRecipients } from './encrypt-with-key-multi-recipients';
diff --git a/src/browser/extract-public-key.js b/src/browser/extract-public-key.js
index 93f8ff0..e45cba3 100644
--- a/src/browser/extract-public-key.js
+++ b/src/browser/extract-public-key.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import VirgilCrypto from './utils/crypto-module';
 import { bufferToByteArray, byteArrayToBuffer } from './utils/crypto-utils';
 import { checkIsBuffer } from './utils/crypto-errors';
diff --git a/src/browser/generate-key-pair-async.js b/src/browser/generate-key-pair-async.js
index 6c4db23..a58b828 100644
--- a/src/browser/generate-key-pair-async.js
+++ b/src/browser/generate-key-pair-async.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import browser from 'bowser';
 import KeyPairType from '../lib/key-pair-type';
 import CryptoWorkerApi from './crypto-worker-api';
diff --git a/src/browser/generate-key-pair.js b/src/browser/generate-key-pair.js
index 32854d7..b686141 100644
--- a/src/browser/generate-key-pair.js
+++ b/src/browser/generate-key-pair.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import VirgilCrypto from './utils/crypto-module';
 import { bufferToByteArray, byteArrayToBuffer } from './utils/crypto-utils';
 import KeyPairType from '../lib/key-pair-type';
diff --git a/src/browser/private-key-to-der.js b/src/browser/private-key-to-der.js
index 69d2ebb..fda8d4a 100644
--- a/src/browser/private-key-to-der.js
+++ b/src/browser/private-key-to-der.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import VirgilCrypto from './utils/crypto-module';
 import { bufferToByteArray, byteArrayToBuffer } from './utils/crypto-utils';
 import { checkIsBuffer } from './utils/crypto-errors';
diff --git a/src/browser/sign-async.js b/src/browser/sign-async.js
index b495860..1902c98 100644
--- a/src/browser/sign-async.js
+++ b/src/browser/sign-async.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import browser from 'bowser';
 import CryptoWorkerApi from './crypto-worker-api';
 import { sign } from './sign';
diff --git a/src/browser/sign.js b/src/browser/sign.js
index 276e688..e75ff24 100644
--- a/src/browser/sign.js
+++ b/src/browser/sign.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import VirgilCrypto from './utils/crypto-module';
 import { bufferToByteArray, byteArrayToBuffer } from './utils/crypto-utils';
 import { checkIsBuffer, throwVirgilError } from './utils/crypto-errors';
diff --git a/src/browser/utils/crypto-errors.js b/src/browser/utils/crypto-errors.js
index 29c2970..8965a36 100644
--- a/src/browser/utils/crypto-errors.js
+++ b/src/browser/utils/crypto-errors.js
@@ -1,3 +1,4 @@
+import { Buffer } from 'buffer';
 import VirgilCryptoError from '../../lib/Error';
 
 export const errors = {
diff --git a/src/browser/utils/crypto-utils.js b/src/browser/utils/crypto-utils.js
index 1465d4c..7c1c1fc 100644
--- a/src/browser/utils/crypto-utils.js
+++ b/src/browser/utils/crypto-utils.js
@@ -1,5 +1,5 @@
-import VirgilCrypto from './crypto-module';
 import { Buffer } from 'buffer';
+import VirgilCrypto from './crypto-module';
 import createWrapper from '../../lib/wrapper';
 
 export const bufferToByteArray = (buffer) => {