diff --git a/src/lib/waku_message/symmetric.ts b/src/lib/waku_message/symmetric.ts
index 9d2890a2a4..f6337fe56b 100644
--- a/src/lib/waku_message/symmetric.ts
+++ b/src/lib/waku_message/symmetric.ts
@@ -7,29 +7,29 @@ export const TagSize = 16;
 const Algorithm = { name: "AES-GCM", length: 128 };
 
 export async function encrypt(
-  iv: Buffer | Uint8Array,
-  key: Buffer,
-  clearText: Buffer
-): Promise<Buffer> {
+  iv: Uint8Array,
+  key: Uint8Array,
+  clearText: Uint8Array
+): Promise<Uint8Array> {
   return getSubtle()
     .importKey("raw", key, Algorithm, false, ["encrypt"])
     .then((cryptoKey) =>
       getSubtle().encrypt({ iv, ...Algorithm }, cryptoKey, clearText)
     )
-    .then(Buffer.from);
+    .then((cipher) => new Uint8Array(cipher));
 }
 
 export async function decrypt(
-  iv: Buffer,
-  key: Buffer,
-  cipherText: Buffer
-): Promise<Buffer> {
+  iv: Uint8Array,
+  key: Uint8Array,
+  cipherText: Uint8Array
+): Promise<Uint8Array> {
   return getSubtle()
     .importKey("raw", key, Algorithm, false, ["decrypt"])
     .then((cryptoKey) =>
       getSubtle().decrypt({ iv, ...Algorithm }, cryptoKey, cipherText)
     )
-    .then(Buffer.from);
+    .then((clear) => new Uint8Array(clear));
 }
 
 export function generateIv(): Uint8Array {