diff --git a/arch/arm64/src/imx9/imx9_lpuart.c b/arch/arm64/src/imx9/imx9_lpuart.c
index 4b4baa77229..d656de14f8a 100644
--- a/arch/arm64/src/imx9/imx9_lpuart.c
+++ b/arch/arm64/src/imx9/imx9_lpuart.c
@@ -2358,6 +2358,7 @@ static void imx9_txint(struct uart_dev_s *dev, bool enable)
   regval &= ~LPUART_ALL_INTS;
   regval |= priv->ie;
   imx9_serialout(priv, IMX9_LPUART_CTRL_OFFSET, regval);
+  spin_unlock_irqrestore(&priv->lock, flags);
 
 #ifndef CONFIG_SUPPRESS_SERIAL_INTS
   if (enable)
@@ -2365,8 +2366,6 @@ static void imx9_txint(struct uart_dev_s *dev, bool enable)
       uart_xmitchars(dev);
     }
 #endif
-
-  spin_unlock_irqrestore(&priv->lock, flags);
 }
 #endif