diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index dd29f69..74089cb 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -2486,6 +2486,7 @@ public:
     typedef typename Encoding::Ch Ch;                       //!< Character type derived from Encoding.
     typedef GenericValue<Encoding, Allocator> ValueType;    //!< Value type of the document.
     typedef Allocator AllocatorType;                        //!< Allocator type from template parameter.
+    typedef StackAllocator StackAllocatorType;              //!< StackAllocator type from template parameter.
 
     //! Constructor
     /*! Creates an empty document of specified type.