diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index 0a5a7b25..516cb5e0 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -1886,14 +1886,13 @@ public:
     */
     template <unsigned parseFlags, typename SourceEncoding, typename InputStream>
     GenericDocument& ParseStream(InputStream& is) {
-        ValueType::SetNull(); // Remove existing root if exist
         GenericReader<SourceEncoding, Encoding, StackAllocator> reader(
             stack_.HasAllocator() ? &stack_.GetAllocator() : 0);
         ClearStackOnExit scope(*this);
         parseResult_ = reader.template Parse<parseFlags>(is, *this);
         if (parseResult_) {
             RAPIDJSON_ASSERT(stack_.GetSize() == sizeof(ValueType)); // Got one and only one root object
-            this->RawAssign(*stack_.template Pop<ValueType>(1));    // Add this-> to prevent issue 13.
+            ValueType::operator=(*stack_.template Pop<ValueType>(1));// Move value from stack to document
         }
         return *this;
     }