diff --git a/SevenZip/SevenZipExtractor.cs b/SevenZip/SevenZipExtractor.cs
index e57cb33..5da8574 100644
--- a/SevenZip/SevenZipExtractor.cs
+++ b/SevenZip/SevenZipExtractor.cs
@@ -454,7 +454,7 @@ private IInStream GetArchiveStream(bool dispose)
         /// <returns>OperationResult.Ok if Open() succeeds.</returns>
         private OperationResult OpenArchiveInner(IInStream archiveStream, IArchiveOpenCallback openCallback)
         {
-            ulong checkPos = 1 << 15;
+            ulong checkPos = 1 << 23;
             var res = _archive.Open(archiveStream, ref checkPos, openCallback);
 
             return (OperationResult)res;