diff --git a/src/libsystemd/sd-event/event-source.h b/src/libsystemd/sd-event/event-source.h
index 385779df2c..a7c1807cd4 100644
--- a/src/libsystemd/sd-event/event-source.h
+++ b/src/libsystemd/sd-event/event-source.h
@@ -106,11 +106,16 @@ struct sd_event_source {
                         pid_t pid;
                         int options;
                         int pidfd;
-                        bool registered:1; /* whether the pidfd is registered in the epoll */
+                        /* We have five bools, and we want to fit them into 4 bytes so the whole struct
+                         * remains 32 bytes. Thus, use bitfields for two of them and single bytes for the
+                         * other three. */
+                        bool registered; /* whether the pidfd is registered in the epoll */
                         bool pidfd_owned:1; /* close pidfd when event source is freed */
                         bool process_owned:1; /* kill+reap process when event source is freed */
-                        bool exited:1; /* true if process exited (i.e. if there's value in SIGKILLing it if we want to get rid of it) */
-                        bool waited:1; /* true if process was waited for (i.e. if there's value in waitid(P_PID)'ing it if we want to get rid of it) */
+                        bool exited; /* true if process exited (i.e. if there's value in SIGKILLing it if
+                                      * we want to get rid of it) */
+                        bool waited; /* true if process was waited for (i.e. if there's value in
+                                      * waitid(P_PID)'ing it if we want to get rid of it) */
                 } child;
                 struct {
                         sd_event_handler_t callback;