diff --git a/sys/compat/linuxkpi/common/include/linux/timer.h b/sys/compat/linuxkpi/common/include/linux/timer.h
--- a/sys/compat/linuxkpi/common/include/linux/timer.h
+++ b/sys/compat/linuxkpi/common/include/linux/timer.h
@@ -83,6 +83,8 @@
 extern void add_timer_on(struct timer_list *, int cpu);
 extern int del_timer(struct timer_list *);
 extern int del_timer_sync(struct timer_list *);
+extern int timer_delete_sync(struct timer_list *);
+extern int timer_shutdown_sync(struct timer_list *);
 
 #define	timer_pending(timer)	callout_pending(&(timer)->callout)
 #define	round_jiffies(j)	\
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -2147,6 +2147,20 @@
 	return (1);
 }
 
+int
+timer_delete_sync(struct timer_list *timer)
+{
+
+	return (del_timer_sync(timer));
+}
+
+int
+timer_shutdown_sync(struct timer_list *timer)
+{
+
+	return (del_timer_sync(timer));
+}
+
 /* greatest common divisor, Euclid equation */
 static uint64_t
 lkpi_gcd_64(uint64_t a, uint64_t b)