diff --git a/src/mainboard/emulation/qemu-i440fx/northbridge.c b/src/mainboard/emulation/qemu-i440fx/northbridge.c
index 2714052..4931523 100644
--- a/src/mainboard/emulation/qemu-i440fx/northbridge.c
+++ b/src/mainboard/emulation/qemu-i440fx/northbridge.c
@@ -16,6 +16,7 @@
 #include "fw_cfg_if.h"
 
 #include "memory.c"
+#include "acpi.h"
 
 static unsigned long qemu_get_high_memory_size(void)
 {