diff --git a/lib/obsolete.rb b/lib/obsolete.rb
index <HASH>..<HASH> 100644
--- a/lib/obsolete.rb
+++ b/lib/obsolete.rb
@@ -55,6 +55,7 @@ module Magick
 
   deprecate_constant 'ConstantVirtualPixelMethod'
   deprecate_constant 'FlattenAlphaChannel'
+  deprecate_constant 'IntegerPixel'
   deprecate_constant 'MatteChannel'
   deprecate_constant 'Rec601LumaColorspace'
   deprecate_constant 'Rec709LumaColorspace'
Deprecated IntegerPixel because this will be removed in ImageMagick 7. (#<I>)