diff --git a/ArcFormats/AudioOGG.cs b/ArcFormats/AudioOGG.cs
index ab83c652..390aef1b 100644
--- a/ArcFormats/AudioOGG.cs
+++ b/ArcFormats/AudioOGG.cs
@@ -151,7 +151,7 @@ namespace GameRes.Formats
                 uint fmt_size = header.ToUInt32 (0x10);
                 long fmt_pos = file.Position;
                 ushort format = file.ReadUInt16();
-                if (format != 0x676F && format != 0x6770 && format != 0x6771)
+                if (format != 0x676F && format != 0x6770 && format != 0x6771 && format != 0x674F)
                     return null;
                 // interpret WAVE 'data' section as Ogg stream
                 file.Position = fmt_pos + ((fmt_size + 1) & ~1);
diff --git a/GameRes/AudioWAV.cs b/GameRes/AudioWAV.cs
index 8f166bf1..3e2870e2 100644
--- a/GameRes/AudioWAV.cs
+++ b/GameRes/AudioWAV.cs
@@ -117,7 +117,7 @@ namespace GameRes
             if (!header.AsciiEqual (8, "WAVE"))
                 return null;
             ushort tag = header.ToUInt16 (0x14);
-            if (0xFFFF == tag || 0x676F == tag || 0x6770 == tag)
+            if (0xFFFF == tag || 0x676F == tag || 0x6770 == tag || 0x674F == tag)
                 return null;
             file.Position = 0;
             SoundInput sound = new WaveInput (file.AsStream);