diff --git a/src/machine/board_lgt92.go b/src/machine/board_lgt92.go
index 29376df1..ee6129b7 100644
--- a/src/machine/board_lgt92.go
+++ b/src/machine/board_lgt92.go
@@ -54,16 +54,18 @@ var (
 
 	// Console UART (LPUSART1)
 	UART0 = UART{
-		Buffer:          NewRingBuffer(),
-		Bus:             stm32.LPUART1,
-		AltFuncSelector: 6,
+		Buffer:            NewRingBuffer(),
+		Bus:               stm32.LPUART1,
+		TxAltFuncSelector: 6,
+		RxAltFuncSelector: 6,
 	}
 
 	// Gps UART
 	UART1 = UART{
-		Buffer:          NewRingBuffer(),
-		Bus:             stm32.USART1,
-		AltFuncSelector: 0,
+		Buffer:            NewRingBuffer(),
+		Bus:               stm32.USART1,
+		TxAltFuncSelector: 0,
+		RxAltFuncSelector: 0,
 	}
 
 	// SPI
diff --git a/src/machine/machine_stm32l0.go b/src/machine/machine_stm32l0.go
index f5a8fb4b..c37d6a02 100644
--- a/src/machine/machine_stm32l0.go
+++ b/src/machine/machine_stm32l0.go
@@ -191,8 +191,8 @@ func enableAltFuncClock(bus unsafe.Pointer) {
 // Configure the UART.
 func (uart UART) configurePins(config UARTConfig) {
 	// enable the alternate functions on the TX and RX pins
-	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.AltFuncSelector)
-	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.AltFuncSelector)
+	config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.TxAltFuncSelector)
+	config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.RxAltFuncSelector)
 }
 
 // UART baudrate calc based on the bus and clockspeed