diff --git a/src/seeder/bitcoin.h b/src/seeder/bitcoin.h
--- a/src/seeder/bitcoin.h
+++ b/src/seeder/bitcoin.h
@@ -19,9 +19,9 @@
 // The network magic to use.
 extern CMessageHeader::MessageMagic netMagic;
 
-enum PeerMessagingState : bool {
-    AwaitingMessages = false,
-    Finished = true,
+enum class PeerMessagingState {
+    AwaitingMessages,
+    Finished,
 };
 
 class CSeederNode {
diff --git a/src/seeder/test/p2p_messaging_tests.cpp b/src/seeder/test/p2p_messaging_tests.cpp
--- a/src/seeder/test/p2p_messaging_tests.cpp
+++ b/src/seeder/test/p2p_messaging_tests.cpp
@@ -8,12 +8,14 @@
 #include <protocol.h>
 #include <seeder/bitcoin.h>
 #include <seeder/db.h>
+#include <seeder/test/util.h>
 #include <serialize.h>
 #include <streams.h>
 #include <util/system.h>
 #include <version.h>
 
 #include <memory>
+#include <ostream>
 #include <string>
 #include <vector>
 
@@ -21,6 +23,11 @@
 
 #include <boost/test/unit_test.hpp>
 
+std::ostream &operator<<(std::ostream &os, const PeerMessagingState &state) {
+    os << to_integral(state);
+    return os;
+}
+
 class TestCSeederNode : public CSeederNode {
 public:
     TestCSeederNode(const CService &service, std::vector<CAddress> *vAddrIn)
diff --git a/src/seeder/test/util.h b/src/seeder/test/util.h
new file mode 100644
--- /dev/null
+++ b/src/seeder/test/util.h
@@ -0,0 +1,15 @@
+// Copyright (c) 2020 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_SEEDER_TEST_UTIL_H
+#define BITCOIN_SEEDER_TEST_UTIL_H
+
+#include <type_traits>
+
+template <typename E>
+constexpr typename std::underlying_type<E>::type to_integral(E e) {
+    return static_cast<typename std::underlying_type<E>::type>(e);
+}
+
+#endif // BITCOIN_SEEDER_TEST_UTIL_H