diff --git a/lib/open_flash_chart/area_base.rb b/lib/open_flash_chart/area_base.rb
index 0972351..8775f54 100644
--- a/lib/open_flash_chart/area_base.rb
+++ b/lib/open_flash_chart/area_base.rb
@@ -2,6 +2,7 @@ module OpenFlashChart
   class AreaBase < Base
     def initialize args={}
       super
+      @type = "area"
       @fill_alpha = 0.35
       @values = []      
     end
@@ -14,4 +15,4 @@ def set_loop
       @loop = true
     end
   end
-end
\ No newline at end of file
+end