diff --git a/libethereum/BlockQueue.cpp b/libethereum/BlockQueue.cpp
index c2bd35afc..013d8a000 100644
--- a/libethereum/BlockQueue.cpp
+++ b/libethereum/BlockQueue.cpp
@@ -418,3 +418,15 @@ void BlockQueue::retryAllUnknown()
 	m_unknown.clear();
 	m_moreToVerify.notify_all();
 }
+
+std::ostream& dev::eth::operator<<(std::ostream& _out, BlockQueueStatus const& _bqs)
+{
+	_out << "verified: " << _bqs.verified << endl;
+	_out << "verifying: " << _bqs.verifying << endl;
+	_out << "unverified: " << _bqs.unverified << endl;
+	_out << "future: " << _bqs.future << endl;
+	_out << "unknown: " << _bqs.unknown << endl;
+	_out << "bad: " << _bqs.bad << endl;
+
+	return _out;
+}
diff --git a/libethereum/BlockQueue.h b/libethereum/BlockQueue.h
index d0437739d..45043559b 100644
--- a/libethereum/BlockQueue.h
+++ b/libethereum/BlockQueue.h
@@ -136,5 +136,7 @@ private:
 	bool m_deleting = false;											///< Exit condition for verifiers.
 };
 
+std::ostream& operator<<(std::ostream& _out, BlockQueueStatus const& _s);
+
 }
 }