diff --git a/sys/contrib/octeon-sdk/cvmx-helper-board.c b/sys/contrib/octeon-sdk/cvmx-helper-board.c
index 06c17b5c8cf..a8cac96e064 100644
--- a/sys/contrib/octeon-sdk/cvmx-helper-board.c
+++ b/sys/contrib/octeon-sdk/cvmx-helper-board.c
@@ -585,6 +585,11 @@ int cvmx_helper_board_get_mii_address(int ipd_port)
 	    default:
 		return -1;
 	    }
+#endif
+#if defined(OCTEON_VENDOR_RADISYS)
+	case CVMX_BOARD_TYPE_CUST_RADISYS_RSYS4GBE:
+	    /* No MII.  */
+	    return -1;
 #endif
     }