diff --git a/drivers/wireless/lpwan/sx127x/sx127x.c b/drivers/wireless/lpwan/sx127x/sx127x.c
index e7e1ed22c0b..3388e2ce9f3 100644
--- a/drivers/wireless/lpwan/sx127x/sx127x.c
+++ b/drivers/wireless/lpwan/sx127x/sx127x.c
@@ -942,7 +942,7 @@ errout:
    */
 
   sx127x_opmode_set(dev, dev->idle);
-  nxsem_post(&dev->dev_lock);
+  nxmutex_unlock(&dev->dev_lock);
 
   return ret;
 #endif