diff --git a/src/seeder/bitcoin.h b/src/seeder/bitcoin.h
--- a/src/seeder/bitcoin.h
+++ b/src/seeder/bitcoin.h
@@ -9,7 +9,9 @@
 #include <protocol.h>
 #include <streams.h>
 
+#include <iostream>
 #include <string>
+#include <type_traits>
 #include <vector>
 
 static inline unsigned short GetDefaultPort() {
@@ -19,11 +21,13 @@
 // The network magic to use.
 extern CMessageHeader::MessageMagic netMagic;
 
-enum PeerMessagingState : bool {
+enum class PeerMessagingState : bool {
     AwaitingMessages = false,
     Finished = true,
 };
 
+std::ostream &operator<<(std::ostream &os, const PeerMessagingState &state);
+
 class CSeederNode {
 private:
     SOCKET sock;
diff --git a/src/seeder/bitcoin.cpp b/src/seeder/bitcoin.cpp
--- a/src/seeder/bitcoin.cpp
+++ b/src/seeder/bitcoin.cpp
@@ -19,6 +19,11 @@
 
 static const uint32_t allones(-1);
 
+std::ostream &operator<<(std::ostream &os, const PeerMessagingState &state) {
+    os << static_cast<std::underlying_type<PeerMessagingState>::type>(state);
+    return os;
+}
+
 void CSeederNode::BeginMessage(const char *pszCommand) {
     if (nHeaderStart != allones) {
         AbortMessage();