diff --git a/drv/usart.c b/drv/usart.c
index 800235b..4901ed2 100644
--- a/drv/usart.c
+++ b/drv/usart.c
@@ -107,7 +107,7 @@ uint32_t usart_write_byte(enum UsartPeriph periph, uint8_t byte)
 
 	if (buffer->buffers) {
 		//if the tx register is empty, there is no need to go through the dma
-		if (regs->SR.TXE) {
+		if (regs->SR.TC) {
 			reg_write(regs->DR, USART_DR_DR, byte);
 			//enable IRQ, disable DMA
 			reg_reset(regs->CR3, USART_CR3_DMAT);