diff --git a/hw/char/serial.c b/hw/char/serial.c
index d8b2db5082..6c5c4a23c7 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -951,13 +951,6 @@ static void serial_unrealize(DeviceState *dev)
     qemu_unregister_reset(serial_reset, s);
 }
 
-/* Change the main reference oscillator frequency. */
-void serial_set_frequency(SerialState *s, uint32_t frequency)
-{
-    s->baudbase = frequency;
-    serial_update_parameters(s);
-}
-
 const MemoryRegionOps serial_io_ops = {
     .read = serial_ioport_read,
     .write = serial_ioport_write,
diff --git a/include/hw/char/serial.h b/include/hw/char/serial.h
index 6e14099ee7..40aad21df3 100644
--- a/include/hw/char/serial.h
+++ b/include/hw/char/serial.h
@@ -93,8 +93,6 @@ struct SerialMM {
 extern const VMStateDescription vmstate_serial;
 extern const MemoryRegionOps serial_io_ops;
 
-void serial_set_frequency(SerialState *s, uint32_t frequency);
-
 #define TYPE_SERIAL "serial"
 OBJECT_DECLARE_SIMPLE_TYPE(SerialState, SERIAL)