diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index be54d4317277ae7274c1fe6abb8d1535136e45ea..a8be77f46da952bb406d22779dc6d5456bef41f1 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -244,12 +244,10 @@ def add_request_method(via, conditions)
           def app(blocks)
             if to.respond_to?(:call)
               Constraints.new(to, blocks, false)
+            elsif blocks.any?
+              Constraints.new(dispatcher(defaults), blocks, true)
             else
-              if blocks.any?
-                Constraints.new(dispatcher(defaults), blocks, true)
-              else
-                dispatcher(defaults)
-              end
+              dispatcher(defaults)
             end
           end