diff --git a/include/linux/timer.h b/include/linux/timer.h
index 648f00105f58..82bb2e4d3b7c 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -183,12 +183,7 @@ extern int timer_reduce(struct timer_list *timer, unsigned long expires);
 extern void add_timer(struct timer_list *timer);
 
 extern int try_to_del_timer_sync(struct timer_list *timer);
-
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
-  extern int del_timer_sync(struct timer_list *timer);
-#else
-# define del_timer_sync(t)		del_timer(t)
-#endif
+extern int del_timer_sync(struct timer_list *timer);
 
 #define del_singleshot_timer_sync(t) del_timer_sync(t)
 
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index ab9688a2ae19..9d09a2a0ad70 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1394,7 +1394,6 @@ static inline void timer_sync_wait_running(struct timer_base *base) { }
 static inline void del_timer_wait_running(struct timer_list *timer) { }
 #endif
 
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
 /**
  * del_timer_sync - Deactivate a timer and wait for the handler to finish.
  * @timer:	The timer to be deactivated
@@ -1475,7 +1474,6 @@ int del_timer_sync(struct timer_list *timer)
 	return ret;
 }
 EXPORT_SYMBOL(del_timer_sync);
-#endif
 
 static void call_timer_fn(struct timer_list *timer,
 			  void (*fn)(struct timer_list *),