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-rw-r--r--stm/usart.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/stm/usart.c b/stm/usart.c
index 1ab385174d..d9de599c46 100644
--- a/stm/usart.c
+++ b/stm/usart.c
@@ -77,7 +77,7 @@ void usart_init(pyb_usart_t usart_id, uint32_t baudrate) {
case PYB_USART_3:
USARTx = USART3;
-#if defined(PYBOARD4)
+#if defined(PYBOARD3) || defined(PYBOARD4)
GPIO_Port = GPIOB;
GPIO_AF_USARTx = GPIO_AF_USART3;
GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;