diff --git a/drivers/serial/pty.c b/drivers/serial/pty.c
index 78cfafeee6f..497b95225a6 100644
--- a/drivers/serial/pty.c
+++ b/drivers/serial/pty.c
@@ -876,7 +876,11 @@ static int pty_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 
       case FIONBIO:
         {
-          ret = file_ioctl(&dev->pd_sink, cmd, arg);
+          ret = file_ioctl(&dev->pd_src, cmd, arg);
+          if (ret >= 0 || ret == -ENOTTY)
+            {
+              ret = file_ioctl(&dev->pd_sink, cmd, arg);
+            }
         }
         break;