diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index 4770c205eb..98e2610bf6 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -3980,6 +3980,7 @@ bool DeviceManager::set_selected_machine(std::string dev_id)
             } else {
                 // lan mode printer reconnect printer
                 if (m_agent) {
+                    m_agent->disconnect_printer();
                     it->second->reset();
                     it->second->connect();
                     it->second->set_lan_mode_connection_state(true);