diff --git a/ArcFormats/uGOS/ImageBMP.cs b/ArcFormats/uGOS/ImageBMP.cs
index 5054a575..d143c278 100644
--- a/ArcFormats/uGOS/ImageBMP.cs
+++ b/ArcFormats/uGOS/ImageBMP.cs
@@ -71,11 +71,9 @@ namespace GameRes.Formats.uGOS
 
         public override ImageData Read (IBinaryStream file, ImageMetaData info)
         {
-            using (var reader = new Reader (file, (DetBmpMetaData)info))
-            {
-                reader.Unpack();
-                return ImageData.CreateFlipped (info, reader.Format, null, reader.Data, reader.Stride);
-            }
+            var reader = new Reader (file, (DetBmpMetaData)info);
+            reader.Unpack();
+            return ImageData.CreateFlipped (info, reader.Format, null, reader.Data, reader.Stride);
         }
 
         public override void Write (Stream file, ImageData image)
@@ -83,7 +81,7 @@ namespace GameRes.Formats.uGOS
             throw new System.NotImplementedException ("DetBmpFormat.Write not implemented");
         }
 
-        internal sealed class Reader : IDisposable
+        internal sealed class Reader
         {
             IBinaryStream   m_input;
             byte[]          m_output;
@@ -451,12 +449,6 @@ namespace GameRes.Formats.uGOS
                     dword_4CB750[i] = OffsetsX[i] + m_width * OffsetsY[i];
                 }
             }
-
-            #region IDisposable Members
-            public void Dispose ()
-            {
-            }
-            #endregion
         }
     }
 }