diff --git a/src/ssn/decryption/decryptChunk.ts b/src/ssn/decryption/decryptChunk.ts
index 7966e81..b41ca26 100644
--- a/src/ssn/decryption/decryptChunk.ts
+++ b/src/ssn/decryption/decryptChunk.ts
@@ -6,7 +6,7 @@ export default function decryptChunk(encryptedChunk: Buffer, [key0, key1, key2]:
   const decryptedChunk = new Buffer(encryptedChunk.length);
   const dvOut = new DataView(decryptedChunk.buffer);
 
-  for (let i = 0; i < length; i += 1) {
+  for (let i = 0; i < encryptedChunk.length; i += 1) {
     //read and decrypt byte
     let curChar = dv.getUint8(i);
     const keyPart = (key2 | 2) & 0xFFFF;