diff --git a/src/ssn/extractFileStream.ts b/src/ssn/extractFileStream.ts
index 2a5443b..ff6d7e8 100644
--- a/src/ssn/extractFileStream.ts
+++ b/src/ssn/extractFileStream.ts
@@ -21,8 +21,8 @@ export default async function extractFileStream(file: ISsnFileEntry, inputStream
     const encryptionHeader = curStream.read(12);
     if (encryptionHeader === null) {
       //need to wait until data is ready for reading
-      await waitReadableLength(curStream, 30);
-      curStream.read(30);
+      await waitReadableLength(curStream, 12);
+      curStream.read(12);
     }
   }