diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
index 845686cb12..2464357971 100644
--- a/hw/isa/isa-bus.c
+++ b/hw/isa/isa-bus.c
@@ -164,6 +164,11 @@ bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
     return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
 }
 
+ISABus *isa_bus_from_device(ISADevice *dev)
+{
+    return ISA_BUS(qdev_get_parent_bus(DEVICE(dev)));
+}
+
 ISADevice *isa_vga_init(ISABus *bus)
 {
     vga_interface_created = true;
diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
index 34fa8977e9..1d3ffec4de 100644
--- a/include/hw/isa/isa.h
+++ b/include/hw/isa/isa.h
@@ -83,6 +83,7 @@ qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq);
 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq);
 MemoryRegion *isa_address_space(ISADevice *dev);
 MemoryRegion *isa_address_space_io(ISADevice *dev);
+ISABus *isa_bus_from_device(ISADevice *dev);
 
 /**
  * isa_register_ioport: Install an I/O port region on the ISA bus.
@@ -120,9 +121,4 @@ int isa_register_portio_list(ISADevice *dev,
                              const MemoryRegionPortio *portio,
                              void *opaque, const char *name);
 
-static inline ISABus *isa_bus_from_device(ISADevice *d)
-{
-    return ISA_BUS(qdev_get_parent_bus(DEVICE(d)));
-}
-
 #endif