diff --git a/include/linux/timer.h b/include/linux/timer.h
index f3dccdb..1794674 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -54,6 +54,7 @@
 		.expires = (_expires),				\
 		.data = (_data),				\
 		.base = &boot_tvec_bases,			\
+		.slack = -1,					\
 		__TIMER_LOCKDEP_MAP_INITIALIZER(		\
 			__FILE__ ":" __stringify(__LINE__))	\
 	}