diff --git a/arch/arm/src/stm32f7/stm32_serial.c b/arch/arm/src/stm32f7/stm32_serial.c
index 88fb21163f..cc9559cde8 100644
--- a/arch/arm/src/stm32f7/stm32_serial.c
+++ b/arch/arm/src/stm32f7/stm32_serial.c
@@ -3336,6 +3336,7 @@ static void up_txint(struct uart_dev_s *dev, bool enable)
 
       up_restoreusartint(priv, ie);
 
+#else
       /* Fake a TX interrupt here by just calling uart_xmitchars() with
        * interrupts disabled (note this may recurse).
        */
diff --git a/arch/arm/src/stm32h7/stm32_serial.c b/arch/arm/src/stm32h7/stm32_serial.c
index 0438108f33..6bc422570d 100644
--- a/arch/arm/src/stm32h7/stm32_serial.c
+++ b/arch/arm/src/stm32h7/stm32_serial.c
@@ -3531,6 +3531,7 @@ static void up_txint(struct uart_dev_s *dev, bool enable)
 
       up_restoreusartint(priv, ie);
 
+#else
       /* Fake a TX interrupt here by just calling uart_xmitchars() with
        * interrupts disabled (note this may recurse).
        */