diff --git a/src/kdf.ts b/src/kdf.ts
index e4249c2..dbd62b8 100644
--- a/src/kdf.ts
+++ b/src/kdf.ts
@@ -59,7 +59,7 @@ export async function hkdf(key: Uint8Array, usage: Usage, context?: string): Pro
     {
       name: 'HKDF',
       hash: 'SHA-512',
-      salt: new Uint8Array(32),
+      salt: new Uint8Array(16),
       info
     },
     material,