diff --git a/ArcFormats/ArcNPA.cs b/ArcFormats/ArcNPA.cs
index f89081e2..97abb1ae 100644
--- a/ArcFormats/ArcNPA.cs
+++ b/ArcFormats/ArcNPA.cs
@@ -34,12 +34,12 @@ using GameRes.Formats.Properties;
 
 namespace GameRes.Formats
 {
-    public class NpaEntry : PackedEntry
+    internal class NpaEntry : PackedEntry
     {
         public byte[] RawName;
     }
 
-    public class NpaArchive : ArcFile
+    internal class NpaArchive : ArcFile
     {
         public NpaTitleId   GameId   { get; private set; }
         public int          Key      { get; private set; }
diff --git a/ArcFormats/ArcXP3.cs b/ArcFormats/ArcXP3.cs
index 97660436..22e0c911 100644
--- a/ArcFormats/ArcXP3.cs
+++ b/ArcFormats/ArcXP3.cs
@@ -583,7 +583,7 @@ NextEntry:
         }
     }
 
-    public class Xp3Stream : Stream
+    internal class Xp3Stream : Stream
     {
         ArcView     m_file;
         Xp3Entry    m_entry;