diff --git a/arch/risc-v/src/mpfs/mpfs_ethernet.c b/arch/risc-v/src/mpfs/mpfs_ethernet.c
index 79f861635c..b47d5cdf7b 100644
--- a/arch/risc-v/src/mpfs/mpfs_ethernet.c
+++ b/arch/risc-v/src/mpfs/mpfs_ethernet.c
@@ -3357,6 +3357,10 @@ static int mpfs_phyinit(struct mpfs_ethmac_s *priv)
     {
       ret = ksz9477_i2c_init(bus, KSZ9477_PORT_SGMII);
     }
+  else
+    {
+      ret = -EINVAL;
+    }
 
 #endif