diff --git a/src/ssn/streams/readLocalFileHeader.ts b/src/ssn/streams/readLocalFileHeader.ts
index adc8eb5..84230eb 100644
--- a/src/ssn/streams/readLocalFileHeader.ts
+++ b/src/ssn/streams/readLocalFileHeader.ts
@@ -17,9 +17,12 @@ function waitReadableLength(inputStream: stream.Readable, minLength: number): Pr
  * Returns length of the local file header.
  */
 export default async function readLocalFileHeader(inputStream: stream.Readable): Promise<number> {
-  //TODO: need to wait until
-  await waitReadableLength(inputStream, 30);
-  const localFileHeader: Buffer = inputStream.read(30);
+  let localFileHeader: Buffer = inputStream.read(30);
+  if (localFileHeader === null) {
+    //need to wait until data is ready for reading
+    await waitReadableLength(inputStream, 30);
+    localFileHeader = inputStream.read(30);
+  }
 
   //Local file header signature
   const magic = localFileHeader.readUInt32LE(0);