diff --git a/mt7603/init.c b/mt7603/init.c
index 80b229f9..091e7bd2 100644
--- a/mt7603/init.c
+++ b/mt7603/init.c
@@ -511,6 +511,8 @@ int mt7603_register_device(struct mt7603_dev *dev)
 	bus_ops->rmw = mt7603_rmw;
 	dev->mt76.bus = bus_ops;
 
+	spin_lock_init(&dev->ps_lock);
+
 	INIT_DELAYED_WORK(&dev->mac_work, mt7603_mac_work);
 	tasklet_init(&dev->pre_tbtt_tasklet, mt7603_pre_tbtt_tasklet,
 		     (unsigned long)dev);