diff --git a/docs/example/DdsImagePlugin.py b/docs/example/DdsImagePlugin.py
index 78aa3ce72..272409416 100644
--- a/docs/example/DdsImagePlugin.py
+++ b/docs/example/DdsImagePlugin.py
@@ -269,9 +269,9 @@ Image.register_decoder("DXT1", DXT1Decoder)
 Image.register_decoder("DXT5", DXT5Decoder)
 
 
-def _validate(prefix):
+def _accept(prefix):
     return prefix[:4] == b"DDS "
 
 
-Image.register_open(DdsImageFile.format, DdsImageFile, _validate)
+Image.register_open(DdsImageFile.format, DdsImageFile, _accept)
 Image.register_extension(DdsImageFile.format, ".dds")
diff --git a/src/PIL/MpoImagePlugin.py b/src/PIL/MpoImagePlugin.py
index 7244aa2a9..7ccf27c42 100644
--- a/src/PIL/MpoImagePlugin.py
+++ b/src/PIL/MpoImagePlugin.py
@@ -21,9 +21,8 @@
 from . import Image, ImageFile, JpegImagePlugin
 from ._binary import i16be as i16
 
-
-def _accept(prefix):
-    return JpegImagePlugin._accept(prefix)
+# def _accept(prefix):
+#     return JpegImagePlugin._accept(prefix)
 
 
 def _save(im, fp, filename):