diff --git a/src/platforms/native/platform.h b/src/platforms/native/platform.h
index 368c2fb..e5ea0c4 100644
--- a/src/platforms/native/platform.h
+++ b/src/platforms/native/platform.h
@@ -254,12 +254,12 @@ int usbuart_debug_write(const char *buf, size_t len);
 #define USBUSART2 USART2
 #define USBUSART2_IRQ NVIC_USART2_IRQ
 #define USBUSART2_ISR(x) usart2_isr(x)
-#define USBUSART2_DMA_TX_CHAN DMA_CHANNEL6
-#define USBUSART2_DMA_TX_IRQ NVIC_DMA1_CHANNEL6_IRQ
-#define USBUSART2_DMA_TX_ISR(x) dma1_channel6_isr(x)
-#define USBUSART2_DMA_RX_CHAN DMA_CHANNEL7
-#define USBUSART2_DMA_RX_IRQ NVIC_DMA1_CHANNEL7_IRQ
-#define USBUSART2_DMA_RX_ISR(x) dma1_channel7_isr(x)
+#define USBUSART2_DMA_TX_CHAN DMA_CHANNEL7
+#define USBUSART2_DMA_TX_IRQ NVIC_DMA1_CHANNEL7_IRQ
+#define USBUSART2_DMA_TX_ISR(x) dma1_channel7_isr(x)
+#define USBUSART2_DMA_RX_CHAN DMA_CHANNEL6
+#define USBUSART2_DMA_RX_IRQ NVIC_DMA1_CHANNEL6_IRQ
+#define USBUSART2_DMA_RX_ISR(x) dma1_channel6_isr(x)
 
 #define TRACE_TIM TIM3
 #define TRACE_TIM_CLK_EN() rcc_periph_clock_enable(RCC_TIM3)
diff --git a/src/platforms/stm32/usbuart.c b/src/platforms/stm32/usbuart.c
index 332ec57..7e0b6de 100644
--- a/src/platforms/stm32/usbuart.c
+++ b/src/platforms/stm32/usbuart.c
@@ -274,7 +274,8 @@ void usbuart_usb_out_cb(usbd_device *dev, uint8_t ep)
 	/* Don't bother if uart is disabled.
 	 * This will be the case on mini while we're being debugged.
 	 */
-	if(!(RCC_APB2ENR & RCC_APB2ENR_USART1EN))
+	if(!(RCC_APB2ENR & RCC_APB2ENR_USART1EN) &&
+	   !(RCC_APB1ENR & RCC_APB1ENR_USART2EN))
 	{
 		usbd_ep_nak_set(dev, CDCACM_UART_ENDPOINT, 0);
 		return;