diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index 5c41ee5017..849fa2e631 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -241,6 +241,8 @@ static void create_fdt(SiFiveUState *s, const struct MemmapEntry *memmap,
     qemu_fdt_setprop_cells(fdt, nodename, "reg",
         0x0, memmap[SIFIVE_U_UART0].base,
         0x0, memmap[SIFIVE_U_UART0].size);
+    qemu_fdt_setprop_cell(fdt, nodename, "clock-frequency",
+                          SIFIVE_U_CLOCK_FREQ / 2);
     qemu_fdt_setprop_cells(fdt, nodename, "interrupt-parent", plic_phandle);
     qemu_fdt_setprop_cells(fdt, nodename, "interrupts", 1);