diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F303xC.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F303xC.py
index fd19eb8ba7..e984db4cc0 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F303xC.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F303xC.py
@@ -433,8 +433,8 @@ DMA_Map = {
     "USART3_RX" :   [(1,3,0)],
     "USART1_TX" :   [(1,4,0)],
     "USART1_RX" :   [(1,5,0)],
-    "USART2_TX" :   [(1,6,0)],
-    "USART2_RX" :   [(1,7,0)],
+    "USART2_RX" :   [(1,6,0)],
+    "USART2_TX" :   [(1,7,0)],
     "I2C2_TX"   :   [(1,4,0)],
     "I2C2_RX"   :   [(1,5,0)],
     "I2C1_TX"   :   [(1,6,0)],