diff --git a/src/main/drivers/stm32/serial_uart_hal.c b/src/main/drivers/stm32/serial_uart_hal.c
index 136ececcb00..decb35a0878 100644
--- a/src/main/drivers/stm32/serial_uart_hal.c
+++ b/src/main/drivers/stm32/serial_uart_hal.c
@@ -264,10 +264,9 @@ bool checkUsartTxOutput(uartPort_t *s)
 void uartTxMonitor(uartPort_t *s)
 {
     uartDevice_t *uart = container_of(s, uartDevice_t, port);
+    IO_t txIO = IOGetByTag(uart->tx.pin);
 
     if (uart->txPinState == TX_PIN_ACTIVE) {
-        IO_t txIO = IOGetByTag(uart->tx.pin);
-
         // Switch TX to an input with pullup so it's state can be monitored
         uart->txPinState = TX_PIN_MONITOR;
         IOConfigGPIO(txIO, IOCFG_IPU);