diff --git a/arch/sim/src/sim/up_hcitty.c b/arch/sim/src/sim/up_hcitty.c
index ee793002011..de60e1bd78f 100644
--- a/arch/sim/src/sim/up_hcitty.c
+++ b/arch/sim/src/sim/up_hcitty.c
@@ -151,9 +151,8 @@ static void bthcitty_pollnotify(FAR struct bthcitty_s *dev,
         }
     }
 
-  bthcitty_post(&dev->recvsem);
-
   nxsem_post(&dev->fdslock);
+  bthcitty_post(&dev->recvsem);
 }
 
 static int bthcitty_open(FAR struct file *filep)