diff --git a/ArcFormats/Ethornell/AudioBGI.cs b/ArcFormats/Ethornell/AudioBGI.cs
index a8c02f27..501d27d8 100644
--- a/ArcFormats/Ethornell/AudioBGI.cs
+++ b/ArcFormats/Ethornell/AudioBGI.cs
@@ -38,6 +38,7 @@ namespace GameRes.Formats.BGI
 
         public BgiAudio ()
         {
+            Signatures = new uint[] { 0x40, 0 };
             Extensions = new string[] { "bw", "", "_bw" };
         }