diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 788e002688f2..1f89ab0e49ac 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -477,7 +477,7 @@ static void stm32_usart_transmit_chars_dma(struct uart_port *port)
 	const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
 	struct circ_buf *xmit = &port->state->xmit;
 	struct dma_async_tx_descriptor *desc = NULL;
-	unsigned int count, i;
+	unsigned int count;
 
 	if (stm32_usart_tx_dma_started(stm32port)) {
 		if (!stm32_usart_tx_dma_enabled(stm32port))
@@ -542,8 +542,7 @@ static void stm32_usart_transmit_chars_dma(struct uart_port *port)
 	return;
 
 fallback_err:
-	for (i = count; i > 0; i--)
-		stm32_usart_transmit_chars_pio(port);
+	stm32_usart_transmit_chars_pio(port);
 }
 
 static void stm32_usart_transmit_chars(struct uart_port *port)