diff --git a/ArcFormats/Leaf/AudioG.cs b/ArcFormats/Leaf/AudioG.cs
index 5dd98bd2..b4cc999d 100644
--- a/ArcFormats/Leaf/AudioG.cs
+++ b/ArcFormats/Leaf/AudioG.cs
@@ -48,6 +48,8 @@ namespace GameRes.Formats.Leaf
             var header = new byte[0x1C];
             if (header.Length != file.Read (header, 0, header.Length))
                 return null;
+            if (Binary.AsciiEqual (header, "OggS") || Binary.AsciiEqual (header, "RIFF"))
+                return null;
             if (header[4] != 0 || header[5] != 2 || LittleEndian.ToInt64 (header, 6) != 0)
                 return null;
             file.Position = 0;