diff --git a/hw/char/serial-isa.c b/hw/char/serial-isa.c
index 9a5928b3ee..2a4c8de1bf 100644
--- a/hw/char/serial-isa.c
+++ b/hw/char/serial-isa.c
@@ -73,7 +73,6 @@ static void serial_isa_realizefn(DeviceState *dev, Error **errp)
     }
     index++;
 
-    s->baudbase = 115200;
     isa_init_irq(isadev, &s->irq, isa->isairq);
     serial_realize_core(s, errp);
     qdev_set_legacy_instance_id(dev, isa->iobase, 3);
diff --git a/hw/char/serial-pci-multi.c b/hw/char/serial-pci-multi.c
index edfbfdca9e..4891f32230 100644
--- a/hw/char/serial-pci-multi.c
+++ b/hw/char/serial-pci-multi.c
@@ -106,7 +106,6 @@ static void multi_serial_pci_realize(PCIDevice *dev, Error **errp)
 
     for (i = 0; i < nports; i++) {
         s = pci->state + i;
-        s->baudbase = 115200;
         serial_realize_core(s, &err);
         if (err != NULL) {
             error_propagate(errp, err);
diff --git a/hw/char/serial-pci.c b/hw/char/serial-pci.c
index f99b6c19e0..db2c17aafd 100644
--- a/hw/char/serial-pci.c
+++ b/hw/char/serial-pci.c
@@ -49,7 +49,6 @@ static void serial_pci_realize(PCIDevice *dev, Error **errp)
     SerialState *s = &pci->state;
     Error *err = NULL;
 
-    s->baudbase = 115200;
     serial_realize_core(s, &err);
     if (err != NULL) {
         error_propagate(errp, err);
diff --git a/hw/char/serial.c b/hw/char/serial.c
index 1746dbc1c4..a4f0566865 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -988,7 +988,7 @@ SerialState *serial_init(int base, qemu_irq irq, int baudbase,
     SerialState *s = SERIAL(dev);
 
     s->irq = irq;
-    s->baudbase = baudbase;
+    qdev_prop_set_uint32(dev, "baudbase", baudbase);
     qdev_prop_set_chr(dev, "chardev", chr);
     serial_realize_core(s, &error_fatal);
     qdev_set_legacy_instance_id(dev, base, 2);
@@ -1002,6 +1002,7 @@ SerialState *serial_init(int base, qemu_irq irq, int baudbase,
 
 static Property serial_properties[] = {
     DEFINE_PROP_CHR("chardev", SerialState, chr),
+    DEFINE_PROP_UINT32("baudbase", SerialState, baudbase, 115200),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -1072,7 +1073,7 @@ SerialState *serial_mm_init(MemoryRegion *address_space,
 
     s->it_shift = it_shift;
     s->irq = irq;
-    s->baudbase = baudbase;
+    qdev_prop_set_uint32(dev, "baudbase", baudbase);
     qdev_prop_set_chr(dev, "chardev", chr);
 
     serial_realize_core(s, &error_fatal);
diff --git a/include/hw/char/serial.h b/include/hw/char/serial.h
index 180cc7c24e..3dc618598e 100644
--- a/include/hw/char/serial.h
+++ b/include/hw/char/serial.h
@@ -58,7 +58,7 @@ typedef struct SerialState {
     CharBackend chr;
     int last_break_enable;
     int it_shift;
-    int baudbase;
+    uint32_t baudbase;
     uint32_t tsr_retry;
     guint watch_tag;
     uint32_t wakeup;