diff --git a/iris/src/irisnet/corelib/netnames.cpp b/iris/src/irisnet/corelib/netnames.cpp
index 5dd3784f9..6e48666e5 100644
--- a/iris/src/irisnet/corelib/netnames.cpp
+++ b/iris/src/irisnet/corelib/netnames.cpp
@@ -27,6 +27,7 @@
 #include <QRandomGenerator>
 #endif
 #include <limits>
+#include <optional>
 
 #define NNDEBUG (qDebug() << this << "#" << __FUNCTION__ << ":")
 static std::optional<bool> enable_logs;
@@ -371,7 +372,8 @@ class ServiceInstance::Private : public QSharedData {
 ServiceInstance::ServiceInstance() : d(new Private) { }
 
 ServiceInstance::ServiceInstance(const QString &instance, const QString &type, const QString &domain,
-                                 const QMap<QString, QByteArray> &attribs) : d(new Private)
+                                 const QMap<QString, QByteArray> &attribs) :
+    d(new Private)
 {
     d->instance = instance;
     d->type     = type;
@@ -1218,8 +1220,9 @@ void ServiceResolver::start(const QStringList &services, const QString &transpor
                 [this, resolver, stats, service](const QList<XMPP::NameRecord> &r) {
                     NNLOG(NNDEBUG << "sl:" << r);
                     QList<ServiceBoundRecord> sbr;
-                    std::transform(r.begin(), r.end(), std::back_inserter(sbr),
-                                   [service](auto const &r) { return ServiceBoundRecord { service, r }; });
+                    std::transform(r.begin(), r.end(), std::back_inserter(sbr), [service](auto const &r) {
+                        return ServiceBoundRecord { service, r };
+                    });
                     d->srvList << sbr;
                     stats->finishOne(true);
                     cleanup_resolver(resolver);
diff --git a/iris/src/irisnet/noncore/cutestuff/bsocket.cpp b/iris/src/irisnet/noncore/cutestuff/bsocket.cpp
index 160c643fc..9ecb18a19 100644
--- a/iris/src/irisnet/noncore/cutestuff/bsocket.cpp
+++ b/iris/src/irisnet/noncore/cutestuff/bsocket.cpp
@@ -27,6 +27,8 @@
 #include <QTcpSocket>
 #include <QTimer>
 
+#include <optional>
+
 // #include <limits>  // if it's still needed please comment why
 
 #define BSDEBUG (qDebug() << this << "#" << __FUNCTION__ << ":")
diff --git a/version b/version
index c55b19dd0..e15b29b36 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-1.5.1927 (2024-05-24, ef5dcb1a)
+1.5.1928 (2024-05-24, 2894f024)