diff --git a/repos/dde_linux/src/lib/lx_emul/clocksource.c b/repos/dde_linux/src/lib/lx_emul/clocksource.c
index b5bdd7de79..3a72ef74ee 100644
--- a/repos/dde_linux/src/lib/lx_emul/clocksource.c
+++ b/repos/dde_linux/src/lib/lx_emul/clocksource.c
@@ -133,6 +133,12 @@ void lx_emul_register_of_clk_initcall(char const *compat, void *fn)
 }
 
 
+/*
+ * private kernel/time header needed for internal functions
+ * used in lx_emul_force_jiffies_update
+ */
+#include <../kernel/time/tick-internal.h>
+
 /*
  * The functions lx_emul_force_jiffies_update, lx_clockevents_program_event
  * and lx_clockevents_program_event implemented here are stripped down
@@ -154,11 +160,6 @@ void lx_emul_register_of_clk_initcall(char const *compat, void *fn)
  */
 
 
-/* kernel/time/timekeeping.h */
-extern int  timekeeping_valid_for_hres(void);
-extern void do_timer(unsigned long ticks);
-
-
 /**
  * based on kernel/time/clockevents.c clockevents_program_event()
  */
@@ -188,12 +189,6 @@ static int lx_clockevents_program_event(struct clock_event_device *dev,
 }
 
 
-/*
- * private kernel/time header needed for internal functions
- * used in lx_emul_force_jiffies_update
- */
-#include <../kernel/time/tick-internal.h>
-
 /**
  * based on kernel/time/tick-common.c tick_handle_periodic()
  */