diff --git a/drivers/serial/uart_async_rx.c b/drivers/serial/uart_async_rx.c
index 8ee3fc54af1f..00a6749c1238 100644
--- a/drivers/serial/uart_async_rx.c
+++ b/drivers/serial/uart_async_rx.c
@@ -137,6 +137,7 @@ void uart_async_rx_reset(struct uart_async_rx *rx_data)
 int uart_async_rx_init(struct uart_async_rx *rx_data,
 		       const struct uart_async_rx_config *config)
 {
+	__ASSERT_NO_MSG(config->buf_cnt > 0);
 	__ASSERT_NO_MSG(config->length / config->buf_cnt <= UINT8_MAX);
 	memset(rx_data, 0, sizeof(*rx_data));
 	rx_data->config = config;