diff --git a/nano/node/messages.cpp b/nano/node/messages.cpp
index ef98f4dd..31a254cd 100644
--- a/nano/node/messages.cpp
+++ b/nano/node/messages.cpp
@@ -1011,6 +1011,11 @@ std::size_t nano::confirm_ack::size (std::size_t count)
 	return result;
 }
 
+std::string nano::confirm_ack::to_string () const
+{
+	return header.to_string () + "\n" + vote->to_json ();
+}
+
 /*
  * frontier_req
  */
diff --git a/nano/node/messages.hpp b/nano/node/messages.hpp
index 9c5095ec..55222546 100644
--- a/nano/node/messages.hpp
+++ b/nano/node/messages.hpp
@@ -210,8 +210,9 @@ public:
 	void serialize (nano::stream &) const override;
 	void visit (nano::message_visitor &) const override;
 	bool operator== (nano::confirm_ack const &) const;
-	std::shared_ptr<nano::vote> vote;
 	static std::size_t size (std::size_t count);
+	std::string to_string () const;
+	std::shared_ptr<nano::vote> vote;
 };
 
 class frontier_req final : public message