diff --git a/lib/substation/processor.rb b/lib/substation/processor.rb
index 489ceed..2351e1f 100644
--- a/lib/substation/processor.rb
+++ b/lib/substation/processor.rb
@@ -67,14 +67,13 @@ def result(response)
       response
     end
 
-    private
-
     # Return handler
     #
     # @return [#call]
     #
     # @api private
     attr_reader :handler
+    private     :handler
 
     # Return failure chain
     #
@@ -82,6 +81,7 @@ def result(response)
     #
     # @api private
     attr_reader :failure_chain
+    private     :failure_chain
 
     # Return executor
     #
@@ -89,6 +89,7 @@ def result(response)
     #
     # @api private
     attr_reader :executor
+    private     :executor
 
     # Execute processor on state
     #