diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index 20a9c5c12b..a211d62f00 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -4079,10 +4079,13 @@ static int source_memory_pressure_initiate_dispatch(sd_event_source *s) {
         return 0; /* go on, dispatch to user callback */
 }
 
-static int mark_post_sources_pending(sd_event *e) {
+static int maybe_mark_post_sources_pending(EventSourceType t, sd_event *e) {
         sd_event_source *z;
         int r;
 
+        if (t == SOURCE_POST)
+                return 0;
+
         SET_FOREACH(z, e->post_sources) {
                 if (event_source_is_offline(z))
                         continue;
@@ -4134,12 +4137,10 @@ static int source_dispatch(sd_event_source *s) {
                         return r;
         }
 
-        if (s->type != SOURCE_POST) {
-                /* If we execute a non-post source, let's mark all post sources as pending. */
-                r = mark_post_sources_pending(s->event);
-                if (r < 0)
-                        return r;
-        }
+        /* If we execute a non-post source, let's mark all post sources as pending. */
+        r = maybe_mark_post_sources_pending(s->type, s->event);
+        if (r < 0)
+                return r;
 
         if (s->type == SOURCE_MEMORY_PRESSURE) {
                 r = source_memory_pressure_initiate_dispatch(s);
@@ -4248,13 +4249,11 @@ static int source_dispatch(sd_event_source *s) {
 
         s->dispatching = false;
 
-        if (saved_type != SOURCE_POST) {
-                /* More post sources might have been added while executing the callback, let's make sure
-                 * those are marked pending as well. */
-                r = mark_post_sources_pending(saved_event);
-                if (r < 0)
-                        return r;
-        }
+        /* More post sources might have been added while executing the callback, let's make sure
+         * those are marked pending as well. */
+        r = maybe_mark_post_sources_pending(saved_type, saved_event);
+        if (r < 0)
+                return r;
 
 finish:
         if (r < 0) {