diff --git a/drivers/wireless/bluetooth/bt_slip.c b/drivers/wireless/bluetooth/bt_slip.c
index faa76dd0c64..ca48747cb5b 100644
--- a/drivers/wireless/bluetooth/bt_slip.c
+++ b/drivers/wireless/bluetooth/bt_slip.c
@@ -558,8 +558,8 @@ static void bt_slip_unack_handle(FAR struct sliphci_s *priv)
         {
           int semcount;
 
-          nxsem_get_value(&priv->sem, &semcount);
-          if (semcount < 0)
+          while (nxsem_get_value(&priv->sem, &semcount) >= 0 &&
+                 semcount <= 0)
             {
               nxsem_post(&priv->sem);
             }