diff --git a/lib/paperclip-compression/base.rb b/lib/paperclip-compression/base.rb
index d5a55ef..f9e33f4 100644
--- a/lib/paperclip-compression/base.rb
+++ b/lib/paperclip-compression/base.rb
@@ -34,11 +34,6 @@ def process_file
       @dst
     end
 
-    private def compress
-      fail MustImplementInSubClassesException,
-           'compress is overridden on a per compressor basis.'
-    end
-
     protected
 
     def process_file?
@@ -71,6 +66,11 @@ def command_path(command)
 
     private
 
+    def compress
+      fail MustImplementInSubClassesException,
+           'compress is overridden on a per compressor basis.'
+    end
+
     def first_processor?
       @first_processor
     end