diff --git a/arch/arm/src/imxrt/imxrt_enet.c b/arch/arm/src/imxrt/imxrt_enet.c
index 933c208bba4..cac04e12e82 100644
--- a/arch/arm/src/imxrt/imxrt_enet.c
+++ b/arch/arm/src/imxrt/imxrt_enet.c
@@ -2025,9 +2025,23 @@ static inline int imxrt_initphy(struct imxrt_driver_s *priv)
       return ret;
     }
 
+  /* Indicate 50MHz clock */
+
   imxrt_writemii(priv, phyaddr, MII_KSZ8081_PHYCTRL2,
                  (phydata | (1 << 7)));
 
+  /* Switch off NAND Tree mode */
+
+  ret = imxrt_readmii(priv, phyaddr, MII_KSZ8081_OMSO, &phydata);
+  if (ret < 0)
+    {
+      nerr("ERROR: Failed to read MII_KSZ8081_OMSO: %d\n", ret);
+      return ret;
+    }
+
+  imxrt_writemii(priv, phyaddr, MII_KSZ8081_OMSO,
+                 (phydata & ~(1 << 5)));
+
   /* Start auto negotiation */
 
   ninfo("%s: Start Autonegotiation...\n",  BOARD_PHY_NAME);