diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
index c795276668..01517a6c6c 100644
--- a/hw/ppc/e500.c
+++ b/hw/ppc/e500.c
@@ -126,7 +126,7 @@ static void dt_serial_create(void *fdt, unsigned long long offset,
     qemu_fdt_setprop_string(fdt, ser, "compatible", "ns16550");
     qemu_fdt_setprop_cells(fdt, ser, "reg", offset, 0x100);
     qemu_fdt_setprop_cell(fdt, ser, "cell-index", idx);
-    qemu_fdt_setprop_cell(fdt, ser, "clock-frequency", 0);
+    qemu_fdt_setprop_cell(fdt, ser, "clock-frequency", PLATFORM_CLK_FREQ_HZ);
     qemu_fdt_setprop_cells(fdt, ser, "interrupts", 42, 2);
     qemu_fdt_setprop_phandle(fdt, ser, "interrupt-parent", mpic);
     qemu_fdt_setprop_string(fdt, "/aliases", alias, ser);