diff --git a/src/cluster/serializer/broker/Serializer.cc b/src/cluster/serializer/broker/Serializer.cc
index 11a7ed86c0..f2308cb627 100644
--- a/src/cluster/serializer/broker/Serializer.cc
+++ b/src/cluster/serializer/broker/Serializer.cc
@@ -20,15 +20,7 @@
 
 using namespace zeek::cluster;
 
-namespace {
-
-/**
- * Convert a cluster::detail::Event to a broker::zeek::Event.
- *
- * @param ev The cluster::detail::Event
- * @return A broker::zeek::Event to be serialized, or nullopt in case of errors.
- */
-std::optional<broker::zeek::Event> to_broker_event(const detail::Event& ev) {
+std::optional<broker::zeek::Event> detail::to_broker_event(const detail::Event& ev) {
     broker::vector xs;
     xs.reserve(ev.args.size());
 
@@ -51,15 +43,7 @@ std::optional<broker::zeek::Event> to_broker_event(const detail::Event& ev) {
     return broker::zeek::Event(ev.HandlerName(), xs, broker::to_timestamp(ev.timestamp));
 }
 
-/**
- * Convert a broker::zeek::Event to cluster::detail::Event by looking
- * it up in Zeek's event handler registry and converting event arguments
- * to the appropriate Val instances.
- *
- * @param broker_ev The broker side event.
- * @returns A zeek::cluster::detail::Event instance, or std::nullopt if the conversion failed.
- */
-std::optional<detail::Event> to_zeek_event(const broker::zeek::Event& ev) {
+std::optional<detail::Event> detail::to_zeek_event(const broker::zeek::Event& ev) {
     auto&& name = ev.name();
     auto&& args = ev.args();
 
@@ -117,8 +101,6 @@ std::optional<detail::Event> to_zeek_event(const broker::zeek::Event& ev) {
     return detail::Event{handler, std::move(vl), ts};
 }
 
-} // namespace
-
 bool detail::BrokerBinV1_Serializer::SerializeEvent(detail::byte_buffer& buf, const detail::Event& event) {
     auto ev = to_broker_event(event);
     if ( ! ev )
diff --git a/src/cluster/serializer/broker/Serializer.h b/src/cluster/serializer/broker/Serializer.h
index 00973b90c1..4b9adae241 100644
--- a/src/cluster/serializer/broker/Serializer.h
+++ b/src/cluster/serializer/broker/Serializer.h
@@ -4,8 +4,30 @@
 
 #include "zeek/cluster/Serializer.h"
 
+namespace broker::zeek {
+class Event;
+}
+
 namespace zeek::cluster::detail {
 
+/**
+ * Convert a broker::zeek::Event to cluster::detail::Event by looking
+ * it up in Zeek's event handler registry and converting event arguments
+ * to the appropriate Val instances.
+ *
+ * @param ev The broker side event.
+ * @returns A zeek::cluster::detail::Event instance, or std::nullopt if the conversion failed.
+ */
+std::optional<detail::Event> to_zeek_event(const broker::zeek::Event& ev);
+
+/**
+ * Convert a cluster::detail::Event to a broker::zeek::Event.
+ *
+ * @param ev The cluster::detail::Event
+ * @return A broker::zeek::Event to be serialized, or nullopt in case of errors.
+ */
+std::optional<broker::zeek::Event> to_broker_event(const detail::Event& ev);
+
 // Implementation of the EventSerializer using the existing broker::detail::val_to_data()
 // and broker::format::bin::v1::encode().
 class BrokerBinV1_Serializer : public EventSerializer {