diff --git a/src/core/timer.c b/src/core/timer.c
index a45e0c393f..2e0a8a17c3 100644
--- a/src/core/timer.c
+++ b/src/core/timer.c
@@ -664,8 +664,6 @@ static int timer_start(Unit *u) {
         if (r < 0)
                 return r;
 
-        t->last_trigger = DUAL_TIMESTAMP_NULL;
-
         /* Reenable all timers that depend on unit activation time */
         LIST_FOREACH(value, v, t->values)
                 if (v->base == TIMER_ACTIVE)