diff --git a/lib/action_controller/parameters.rb b/lib/action_controller/parameters.rb
index 9dc3d7d..ec858e0 100644
--- a/lib/action_controller/parameters.rb
+++ b/lib/action_controller/parameters.rb
@@ -63,7 +63,7 @@ def require(key)
     def permit(*filters)
       params = self.class.new
 
-      filters.each do |filter|
+      filters.flatten.each do |filter|
         case filter
         when Symbol, String
           permitted_scalar_filter(params, filter)
diff --git a/test/parameters_permit_test.rb b/test/parameters_permit_test.rb
index b1905a9..7bf9606 100644
--- a/test/parameters_permit_test.rb
+++ b/test/parameters_permit_test.rb
@@ -104,6 +104,12 @@ def assert_filtered_out(params, key)
     assert_equal nil, permitted[:c]
   end
 
+  test 'permit parameters as an array' do
+    params = ActionController::Parameters.new(:foo => 'bar')
+
+    assert_equal 'bar', params.permit([:foo])[:foo]
+  end
+
   # --- key to empty array -----------------------------------------------------
 
   test 'key to empty array: empty arrays pass' do