diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index bac394c959..2fb6ee231f 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -94,9 +94,10 @@ static const MemMapEntry sifive_u_memmap[] = {
 #define GEM_REVISION        0x10070109
 
 static void create_fdt(SiFiveUState *s, const MemMapEntry *memmap,
-                       uint64_t mem_size, const char *cmdline, bool is_32_bit)
+                       bool is_32_bit)
 {
-    MachineState *ms = MACHINE(qdev_get_machine());
+    MachineState *ms = MACHINE(s);
+    uint64_t mem_size = ms->ram_size;
     void *fdt;
     int cpu, fdt_size;
     uint32_t *cells;
@@ -560,8 +561,7 @@ static void sifive_u_machine_init(MachineState *machine)
                           qemu_allocate_irq(sifive_u_machine_reset, NULL, 0));
 
     /* create device tree */
-    create_fdt(s, memmap, machine->ram_size, machine->kernel_cmdline,
-               riscv_is_32bit(&s->soc.u_cpus));
+    create_fdt(s, memmap, riscv_is_32bit(&s->soc.u_cpus));
 
     if (s->start_in_flash) {
         /*