diff --git a/src/platforms/common/usb_serial.c b/src/platforms/common/usb_serial.c
index 424ffe8..1572a44 100644
--- a/src/platforms/common/usb_serial.c
+++ b/src/platforms/common/usb_serial.c
@@ -231,12 +231,12 @@ static uint32_t copy_from_fifo(char *dst, const char *src, uint32_t start, uint3
 }
 
 /*
- * Runs deferred processing for USBUSART RX, draining RX FIFO by sending
- * characters to host PC via CDCACM. Allowed to write to FIFO OUT pointer.
+ * Runs deferred processing for AUX serial RX, draining RX FIFO by sending
+ * characters to host PC via the debug serial interface. Allowed to write to FIFO OUT pointer.
  */
 static void debug_uart_send_rx_packet(void)
 {
-	rx_usb_trfr_cplt = false;
+	aux_serial_receive_complete = false;
 	/* Calculate writing position in the FIFO */
 	const uint32_t buf_rx_in = (RX_FIFO_SIZE - dma_get_number_of_data(USBUSART_DMA_BUS, USBUSART_DMA_RX_CHAN)) % RX_FIFO_SIZE;
 
@@ -254,7 +254,7 @@ static void debug_uart_send_rx_packet(void)
 		buf_rx_out = buf_rx_in;
 		/* Turn off LED */
 		usbuart_set_led_state(RX_LED_ACT, false);
-		rx_usb_trfr_cplt = true;
+		aux_serial_receive_complete = true;
 	}
 	else
 	{
@@ -293,7 +293,7 @@ void debug_uart_run(void)
 	usbuart_set_led_state(RX_LED_ACT, true);
 
 	/* Try to send a packet if usb is idle */
-	if (rx_usb_trfr_cplt)
+	if (aux_serial_receive_complete)
 		debug_uart_send_rx_packet();
 
 	nvic_enable_irq(USB_IRQ);
diff --git a/src/platforms/common/usbuart.h b/src/platforms/common/usbuart.h
index d7f32a4..513764a 100644
--- a/src/platforms/common/usbuart.h
+++ b/src/platforms/common/usbuart.h
@@ -46,7 +46,7 @@ extern char buf_rx[RX_FIFO_SIZE + sizeof(uint64_t)];
 /* RX Fifo out pointer, writes assumed to be atomic */
 extern uint8_t buf_rx_out;
 /* RX usb transfer complete */
-extern bool rx_usb_trfr_cplt;
+extern bool aux_serial_receive_complete;
 
 #ifdef ENABLE_DEBUG
 /* Debug Fifo buffer with space for copy fn overrun */
diff --git a/src/platforms/stm32/usbuart.c b/src/platforms/stm32/usbuart.c
index 496d9cc..cb54ec0 100644
--- a/src/platforms/stm32/usbuart.c
+++ b/src/platforms/stm32/usbuart.c
@@ -43,7 +43,7 @@ char buf_rx[RX_FIFO_SIZE + sizeof(uint64_t)];
 /* RX Fifo out pointer, writes assumed to be atomic */
 uint8_t buf_rx_out;
 /* RX usb transfer complete */
-bool rx_usb_trfr_cplt = true;
+bool aux_serial_receive_complete = true;
 
 #ifdef ENABLE_DEBUG
 /* Debug Fifo buffer with space for copy fn overrun */