diff --git a/hw/isa-bus.c b/hw/isa-bus.c
index dcbb1348f3..7c94f0b7ba 100644
--- a/hw/isa-bus.c
+++ b/hw/isa-bus.c
@@ -22,11 +22,6 @@
 #include "isa.h"
 #include "exec-memory.h"
 
-struct ISABus {
-    BusState qbus;
-    MemoryRegion *address_space_io;
-    qemu_irq *irqs;
-};
 static ISABus *isabus;
 target_phys_addr_t isa_mem_base = 0;
 
diff --git a/hw/isa.h b/hw/isa.h
index 1e75f87771..b11a0be27f 100644
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -12,6 +12,12 @@
 typedef struct ISADevice ISADevice;
 typedef struct ISADeviceInfo ISADeviceInfo;
 
+struct ISABus {
+    BusState qbus;
+    MemoryRegion *address_space_io;
+    qemu_irq *irqs;
+};
+
 struct ISADevice {
     DeviceState qdev;
     uint32_t isairq[2];