diff --git a/src/ssn/extractFileStream.ts b/src/ssn/extractFileStream.ts
index 7e7dab9..ca7899d 100644
--- a/src/ssn/extractFileStream.ts
+++ b/src/ssn/extractFileStream.ts
@@ -32,7 +32,7 @@ export default function extractFileStream(file: ISsnFileEntry, inputStream: stre
   let curStream = inputStream;
 
   //set max length
-  const maxLength = streamSetMaxLength(curStream, file.compressedSize);
+  const maxLength = streamSetMaxLength(curStream, 12 + file.compressedSize);
   curStream = maxLength;
 
   //pipe into decryption if file is encrypted