diff --git a/wayland_server.cpp b/wayland_server.cpp
index fa53d3e82b..0ff9787c52 100644
--- a/wayland_server.cpp
+++ b/wayland_server.cpp
@@ -734,7 +734,7 @@ quint16 WaylandServer::createClientId(ClientConnection *c)
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
     const QSet<unsigned short> ids(m_clientIds.constBegin(), m_clientIds.constEnd());
 #else
-    const auto ids = m_clientIds.toSet();
+    const auto ids = m_clientIds.values().toSet();
 #endif
     quint16 id = 1;
     if (!ids.isEmpty()) {