diff --git a/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c b/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c
index 250ead853a..9c3e747d5b 100644
--- a/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c
+++ b/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c
@@ -7,6 +7,7 @@
 #include <time.h>
 #include <signal.h>
 #include <sys/stat.h>
+#include <unistd.h>
 
 #include <xenctrl.h>
 #include <xenguest.h>