diff --git a/src/slic3r/GUI/StatusPanel.cpp b/src/slic3r/GUI/StatusPanel.cpp
index 6f2067b43..04ff35f52 100644
--- a/src/slic3r/GUI/StatusPanel.cpp
+++ b/src/slic3r/GUI/StatusPanel.cpp
@@ -3436,7 +3436,7 @@ void StatusPanel::update_ams(MachineObject *obj)
                         m_ams_control->StopRridLoading(ams_id, tray_id);
                     }
                 } else {
-                    int check_flag = (1 << 16) + ams_id_int - 128;
+                    int check_flag = (1 << (16 + ams_id_int - 128));
                     if ((obj->tray_reading_bits & check_flag) != 0) {
                         m_ams_control->PlayRridLoading(ams_id, tray_id);
                     } else {