diff --git a/activemodel/lib/active_model/mass_assignment_security.rb b/activemodel/lib/active_model/mass_assignment_security.rb
index c04de5b9a4..3f9feb7631 100644
--- a/activemodel/lib/active_model/mass_assignment_security.rb
+++ b/activemodel/lib/active_model/mass_assignment_security.rb
@@ -111,7 +111,7 @@ module ActiveModel
         options = args.extract_options!
         role = options[:as] || :default
 
-        self._protected_attributes        = protected_attributes_configs.dup
+        self._protected_attributes = protected_attributes_configs.dup
 
         Array.wrap(role).each do |name|
           self._protected_attributes[name] = self.protected_attributes(name) + args
@@ -173,7 +173,7 @@ module ActiveModel
         options = args.extract_options!
         role = options[:as] || :default
 
-        self._accessible_attributes       = accessible_attributes_configs.dup
+        self._accessible_attributes = accessible_attributes_configs.dup
 
         Array.wrap(role).each do |name|
           self._accessible_attributes[name] = self.accessible_attributes(name) + args