diff --git a/src/core/mount.c b/src/core/mount.c
index 453a83f93d..4c12542bd7 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -1753,7 +1753,7 @@ static void mount_enumerate(Manager *m) {
                         goto fail;
                 }
 
-                r = sd_event_source_set_priority(m->mount_event_source, -10);
+                r = sd_event_source_set_priority(m->mount_event_source, SD_EVENT_PRIORITY_NORMAL-10);
                 if (r < 0) {
                         log_error_errno(r, "Failed to adjust mount watch priority: %m");
                         goto fail;
diff --git a/src/core/swap.c b/src/core/swap.c
index 849ccbdd43..70097ff2ba 100644
--- a/src/core/swap.c
+++ b/src/core/swap.c
@@ -1309,7 +1309,7 @@ static void swap_enumerate(Manager *m) {
                 /* Dispatch this before we dispatch SIGCHLD, so that
                  * we always get the events from /proc/swaps before
                  * the SIGCHLD of /sbin/swapon. */
-                r = sd_event_source_set_priority(m->swap_event_source, -10);
+                r = sd_event_source_set_priority(m->swap_event_source, SD_EVENT_PRIORITY_NORMAL-10);
                 if (r < 0) {
                         log_error_errno(r, "Failed to change /proc/swaps priority: %m");
                         goto fail;