diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index 76c97e1c9d..4a4cc3a20e 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -2725,6 +2725,9 @@ _public_ int sd_event_source_set_time_relative(sd_event_source *s, uint64_t usec
         assert_return(s, -EINVAL);
         assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM);
 
+        if (usec == USEC_INFINITY)
+                return sd_event_source_set_time(s, USEC_INFINITY);
+
         r = sd_event_now(s->event, event_source_type_to_clock(s->type), &t);
         if (r < 0)
                 return r;