diff --git a/arch/risc-v/src/mpfs/mpfs_ethernet.c b/arch/risc-v/src/mpfs/mpfs_ethernet.c
index bea93cc80ab65..cbf77b7692157 100644
--- a/arch/risc-v/src/mpfs/mpfs_ethernet.c
+++ b/arch/risc-v/src/mpfs/mpfs_ethernet.c
@@ -134,7 +134,7 @@
  * issue when using the MTU size receive block
  */
 
-#define GMAC_RX_UNITSIZE  (512)                  /* Fixed size for RX buffer */
+#define GMAC_RX_UNITSIZE  (1536)                  /* Fixed size for RX buffer */
 #define GMAC_TX_UNITSIZE  CONFIG_NET_ETH_PKTSIZE /* MAX size for Ethernet packet */
 
 /* The MAC can support frame lengths up to 1536 bytes */