1 files changed, 1 insertions, 1 deletions
diff --git a/src/document.cc b/src/document.cc
index 498e50f..7304c8a 100644
--- a/src/document.cc
+++ b/src/document.cc
@@ -40,7 +40,7 @@ public:
   }
 
   std::unique_ptr<Transport::Response> build(Transport* transport) override {
-    std::string data;
+    std::string data = "<!DOCTYPE html>";
     html_->render(&data);
     auto sha256 = HashMethod::sha256();
     sha256->update(data.data(), data.size());