diff --git a/bin/schedule_building.pl b/bin/schedule_building.pl
index 2a414ba0..50de5b14 100644
--- a/bin/schedule_building.pl
+++ b/bin/schedule_building.pl
@@ -53,7 +53,18 @@ if ($initialize) {
     # existing jobs
     out('Reinitializing all jobs');
     out('Deleting existing jobs');
-    my $schedule_rs = Lacuna->db->resultset('Schedule')->search;
+    # Only delete the Schedule rows this script owns and is about to
+    # recreate below. A blanket ->search (no filter) here would also wipe
+    # out entries owned by other scheduler processes (e.g. the 'arrive'
+    # rows created by schedule_ship_arrival.pl for Travelling ships),
+    # deleting their beanstalk jobs along with them with nothing left to
+    # recreate those jobs, since this script never re-adds 'arrive' rows.
+    my $schedule_rs = Lacuna->db->resultset('Schedule')->search({
+        -or => [
+            { parent_table => 'Building' },
+            { parent_table => 'Ships', task => 'finish_construction' },
+        ],
+    });
     while (my $schedule = $schedule_rs->next) {
         # note. deleting the DB entry also deletes the entry on beanstalk
         $schedule->delete;