diff --git a/SevenZip/StreamWrappers.cs b/SevenZip/StreamWrappers.cs
index 487df95..391f7bd 100644
--- a/SevenZip/StreamWrappers.cs
+++ b/SevenZip/StreamWrappers.cs
@@ -347,7 +347,7 @@ internal sealed class InMultiStreamWrapper : MultiStreamWrapper, ISequentialInSt
             int i = 0;
             while (File.Exists(fileName))
             {
-                Streams.Add(new FileStream(fileName, FileMode.Open));
+                Streams.Add(new FileStream(fileName, FileMode.Open, FileAccess.Read));
                 long length = Streams[i].Length;
                 StreamOffsets.Add(i++, new KeyValuePair<long, long>(StreamLength, StreamLength + length));
                 StreamLength += length;
@@ -505,4 +505,4 @@ private void OnBytesWritten(IntEventArgs e)
         }
     }
 #endif
-}
\ No newline at end of file
+}