diff --git a/drivers/ethernet/eth_stm32_hal.c b/drivers/ethernet/eth_stm32_hal.c
index 9a89cb3..d9ab233 100644
--- a/drivers/ethernet/eth_stm32_hal.c
+++ b/drivers/ethernet/eth_stm32_hal.c
@@ -312,7 +312,7 @@
 	heth = &dev_data->heth;
 
 	total_len = net_pkt_get_len(pkt);
-	if (total_len > ETH_STM32_TX_BUF_SIZE) {
+	if (total_len > (ETH_STM32_TX_BUF_SIZE * ETH_TXBUFNB)) {
 		LOG_ERR("PKT too big");
 		return -EIO;
 	}