diff --git a/src/core/execute.c b/src/core/execute.c
index ec95ce3d10..54775e9dfa 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -1621,7 +1621,7 @@ static void do_idle_pipe_dance(int idle_pipe[static 4]) {
                         n = write(idle_pipe[3], "x", 1);
                         if (n > 0)
                                 /* Wait for systemd to react to the signal above. */
-                                fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
+                                (void) fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
                 }
 
                 idle_pipe[0] = safe_close(idle_pipe[0]);
diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index 5adbceeb02..ee10728ece 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -2552,7 +2552,7 @@ static int process_child(sd_event *e) {
                                  * benefit in leaving it queued */
 
                                 assert(s->child.options & (WSTOPPED|WCONTINUED));
-                                waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED)));
+                                (void) waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED)));
                         }
 
                         r = source_set_pending(s, true);