diff --git a/src/SharpCompress/Archives/ArchiveFactory.cs b/src/SharpCompress/Archives/ArchiveFactory.cs
index 02c10699..b81e2c0e 100644
--- a/src/SharpCompress/Archives/ArchiveFactory.cs
+++ b/src/SharpCompress/Archives/ArchiveFactory.cs
@@ -189,9 +189,10 @@ public static class ArchiveFactory
 
         foreach (var factory in Factory.Factories)
         {
+            var isArchive = factory.IsArchive(stream);
             stream.Position = startPosition;
 
-            if (factory.IsArchive(stream, null))
+            if (isArchive)
             {
                 type = factory.KnownArchiveType;
                 return true;