diff --git a/sw/airborne/boards/apogee_1.0.h b/sw/airborne/boards/apogee_1.0.h
index 49e3c5cc1f..eba373f9d3 100644
--- a/sw/airborne/boards/apogee_1.0.h
+++ b/sw/airborne/boards/apogee_1.0.h
@@ -113,7 +113,7 @@
 #define POWER_SWITCH_LED 9
 
 
-/* Uart2 RX polarity, on PB13, 1 on LED_ON, 0 on LED_OFF */
+/* Pint to set Uart2 RX polarity, on PB13, output low inverts, high doesn't */
 #define RC_POLARITY_GPIO_PORT GPIOB
 #define RC_POLARITY_GPIO_PIN GPIO13
 
diff --git a/sw/airborne/mcu_periph/uart.h b/sw/airborne/mcu_periph/uart.h
index e98cafb1f1..84fc1626a6 100644
--- a/sw/airborne/mcu_periph/uart.h
+++ b/sw/airborne/mcu_periph/uart.h
@@ -51,15 +51,15 @@
 #define B230400  230400
 #define B921600  921600
 
-#define UBITS_7 0
-#define UBITS_8 1
+#define UBITS_7 7
+#define UBITS_8 8
 
-#define USTOP_1 0
-#define USTOP_2 1
+#define USTOP_1 1
+#define USTOP_2 2
 
 #define UPARITY_NO    0
-#define UPARITY_EVEN  1
-#define UPARITY_ODD   2
+#define UPARITY_ODD   1
+#define UPARITY_EVEN  2
 
 /**
  * UART peripheral