diff --git a/src/ssn/decryption/decryptFile.ts b/src/ssn/decryption/decryptFile.ts
index a9780fe..996fd6b 100644
--- a/src/ssn/decryption/decryptFile.ts
+++ b/src/ssn/decryption/decryptFile.ts
@@ -1,7 +1,7 @@
 import updateKeys from './updateKeys';
 
 export default function decryptFile(dv: DataView, length: number, [key0, key1, key2]: [number, number, number]) {
-  const decryptedBuffer = new ArrayBuffer(dv.byteLength - 12);
+  const decryptedBuffer = new ArrayBuffer(length - 12);
   const dvOut = new DataView(decryptedBuffer);
 
   for (let i = 0; i < length; i += 1) {
@@ -19,6 +19,5 @@ export default function decryptFile(dv: DataView, length: number, [key0, key1, k
     [key0, key1, key2] = updateKeys([key0, key1, key2], curChar);
   }
 
-  //If it was decrypted, we skip the first 12 bytes (random encryption header)
   return dvOut;
 }