gistfile1.diff

diff --git a/lib/carrierwave/uploader/processing.rb b/lib/carrierwave/uploader/processing.rb
index 7c37d5b..73994cd 100644
--- a/lib/carrierwave/uploader/processing.rb
+++ b/lib/carrierwave/uploader/processing.rb
@@ -8,7 +8,7 @@ module CarrierWave
       include CarrierWave::Uploader::Callbacks
 
       included do
-        class_inheritable_accessor :processors, :instance_reader => false, :instance_writer => false
+        class_attribute :processors, :instance_writer => false
         self.processors = []
 
         after :cache, :process!
@@ -63,10 +63,10 @@ module CarrierWave
             if arg.is_a?(Hash)
               condition = arg.delete(:if)
               arg.each do |method, args|
-                processors.push([method, args, condition])
+                self.processors += [[method, args, condition]]
               end
             else
-              processors.push([arg, [], nil])
+              self.processors += [[arg, [], nil]]
             end
           end
         end
diff --git a/lib/carrierwave/uploader/versions.rb b/lib/carrierwave/uploader/versions.rb
index 8e26461..c124901 100644
--- a/lib/carrierwave/uploader/versions.rb
+++ b/lib/carrierwave/uploader/versions.rb
@@ -76,6 +76,7 @@ module CarrierWave
             RUBY
             # as the processors get the output from the previous processors as their
             # input we must not stack the processors here
+            versions[name][:uploader].processors = versions[name][:uploader].processors.dup
             versions[name][:uploader].processors.clear
           end
           versions[name][:uploader].class_eval(&block) if block