diff --git a/ArcFormats/Ethornell/ImageBGI.cs b/ArcFormats/Ethornell/ImageBGI.cs
index 2f9df00d..05065503 100644
--- a/ArcFormats/Ethornell/ImageBGI.cs
+++ b/ArcFormats/Ethornell/ImageBGI.cs
@@ -43,7 +43,7 @@ namespace GameRes.Formats.BGI
 
         public BgiFormat ()
         {
-            Extensions = new string[] { "", "bgi", "_bg" };
+            Extensions = new string[] { "", "bgi", "_bg", "bg" };
         }
 
         public override void Write (Stream file, ImageData image)