diff --git a/board/sweetberry/gpio.inc b/board/sweetberry/gpio.inc
index b559d8b875..cfab7fc1f3 100644
--- a/board/sweetberry/gpio.inc
+++ b/board/sweetberry/gpio.inc
@@ -41,12 +41,15 @@ GPIO(I2C3_SDA,			PIN(B, 4), GPIO_INPUT)
 GPIO(FMPI2C_SCL,		PIN(C, 6), GPIO_INPUT)
 GPIO(FMPI2C_SDA,		PIN(C, 7), GPIO_INPUT)
 
-/* USART3 TX/RX */
-GPIO(MCU_UART3_TX,		PIN(C, 10), GPIO_INPUT)
-GPIO(MCU_UART3_RX,		PIN(C, 11), GPIO_INPUT)
-/* USART4 TX/RX */
-GPIO(MCU_UART4_TX,		PIN(A, 0), GPIO_INPUT)
-GPIO(MCU_UART4_RX,		PIN(A, 1), GPIO_INPUT)
+/* These pin assignments aren't used as GPIO. Let's note them here
+ * for readability but not initialize them.
+ * USART3 TX/RX
+ * GPIO(MCU_UART3_TX,		PIN(C, 10), GPIO_INPUT)
+ * GPIO(MCU_UART3_RX,		PIN(C, 11), GPIO_INPUT)
+ * USART4 TX/RX
+ * GPIO(MCU_UART4_TX,		PIN(A, 0), GPIO_INPUT)
+ * GPIO(MCU_UART4_RX,		PIN(A, 1), GPIO_INPUT)
+ */
 
 /* USB pins */
 GPIO(USB_FS_DM,			PIN(A, 11), GPIO_INPUT)