diff --git a/actionview/lib/action_view/routing_url_for.rb b/actionview/lib/action_view/routing_url_for.rb
index b4cbc80bd5b3c21e170cb8451ea7ce36d8cac29b..87e7e9ade7b6b27d37e54cfa23db475a6781ea33 100644
--- a/actionview/lib/action_view/routing_url_for.rb
+++ b/actionview/lib/action_view/routing_url_for.rb
@@ -84,21 +84,13 @@ def url_for(options = nil)
       when Hash
         options = options.symbolize_keys
         unless options.key?(:only_path)
-          if options[:host].nil?
-            options[:only_path] = _generate_paths_by_default
-          else
-            options[:only_path] = false
-          end
+          options[:only_path] = only_path?(options[:host])
         end
 
         super(options)
       when ActionController::Parameters
         unless options.key?(:only_path)
-          if options[:host].nil?
-            options[:only_path] = _generate_paths_by_default
-          else
-            options[:only_path] = false
-          end
+          options[:only_path] = only_path?(options[:host])
         end
 
         super(options)
@@ -147,5 +139,9 @@ def optimize_routes_generation? #:nodoc:
       def _generate_paths_by_default
         true
       end
+
+      def only_path?(host)
+        _generate_paths_by_default unless host
+      end
   end
 end