diff --git a/lib/redmine/views/builders/structure.rb b/lib/redmine/views/builders/structure.rb
index c168bd73..9b948158 100644
--- a/lib/redmine/views/builders/structure.rb
+++ b/lib/redmine/views/builders/structure.rb
@@ -56,7 +56,11 @@ module Redmine
             if @struct.last.is_a?(Array)
               @struct.last << ret
             else
-              @struct.last[sym] = ret
+              if @struct.last.has_key?(sym) && @struct.last[sym].is_a?(Hash)
+                @struct.last[sym].merge! ret
+              else
+                @struct.last[sym] = ret
+              end
             end
           end
         end
diff --git a/test/unit/lib/redmine/views/builders/json_test.rb b/test/unit/lib/redmine/views/builders/json_test.rb
index 195fba02..919fe223 100644
--- a/test/unit/lib/redmine/views/builders/json_test.rb
+++ b/test/unit/lib/redmine/views/builders/json_test.rb
@@ -35,6 +35,13 @@ class Redmine::Views::Builders::JsonTest < HelperTestCase
         b.birth :city => 'London', :country => 'UK'
       end
     end
+    
+    assert_json_output({'person' => {'id' => 1, 'name' => 'Ryan', 'birth' => {'city' => 'London', 'country' => 'UK'}}}) do |b|
+      b.person :id => 1 do
+        b.name 'Ryan'
+        b.birth :city => 'London', :country => 'UK'
+      end
+    end
   end
   
   def test_array