diff --git a/GameRes/ImageBMP.cs b/GameRes/ImageBMP.cs
index 8ee0c054..0fc5416c 100644
--- a/GameRes/ImageBMP.cs
+++ b/GameRes/ImageBMP.cs
@@ -47,6 +47,7 @@ namespace GameRes
     }
 
     [Export(typeof(ImageFormat))]
+    [ExportMetadata("Priority", 10)]
     public sealed class BmpFormat : ImageFormat
     {
         public override string         Tag { get { return "BMP"; } }
diff --git a/GameRes/ImageJPEG.cs b/GameRes/ImageJPEG.cs
index 3de37066..41ddd25f 100644
--- a/GameRes/ImageJPEG.cs
+++ b/GameRes/ImageJPEG.cs
@@ -34,6 +34,7 @@ using GameRes.Utility;
 namespace GameRes
 {
     [Export(typeof(ImageFormat))]
+    [ExportMetadata("Priority", 10)]
     public class JpegFormat : ImageFormat
     {
         public override string         Tag { get { return "JPEG"; } }