1 files changed, 3 insertions, 0 deletions

diff --git a/hw/isa.h b/hw/isa.h
index 89b3004..222e4f3 100644
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -1,3 +1,5 @@
+#ifndef HW_ISA_H
+#define HW_ISA_H
 /* ISA bus */
 
 extern target_phys_addr_t isa_mem_base;
@@ -22,3 +24,4 @@ void DMA_init (int high_page_enable);
 void DMA_register_channel (int nchan,
                            DMA_transfer_handler transfer_handler,
                            void *opaque);
+#endif