diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
index 4f30dd50a4..380acfa7c8 100644
--- a/hw/timer/hpet.c
+++ b/hw/timer/hpet.c
@@ -36,6 +36,7 @@
 #include "hw/rtc/mc146818rtc_regs.h"
 #include "migration/vmstate.h"
 #include "hw/timer/i8254.h"
+#include "exec/address-spaces.h"
 
 //#define HPET_DEBUG
 #ifdef HPET_DEBUG