diff --git a/drivers/dma/dmamux_stm32.c b/drivers/dma/dmamux_stm32.c
index 79d76cfa3b6..8f2989ec1b9 100644
--- a/drivers/dma/dmamux_stm32.c
+++ b/drivers/dma/dmamux_stm32.c
@@ -94,8 +94,9 @@ int dmamux_stm32_configure(const struct device *dev, uint32_t id,
 	 */
 	int request_id = config->dma_slot;
 
-	if (request_id >= dev_config->req_nb + dev_config->gen_nb) {
-		LOG_ERR("request ID %d is too big.", request_id);
+	if (request_id == 0 ||
+	    request_id > dev_config->req_nb + dev_config->gen_nb) {
+		LOG_ERR("request ID %d is not valid.", request_id);
 		return -EINVAL;
 	}