diff --git a/hook/find-collisions.py b/hook/find-collisions.py
index db6526e54af29f970be7353b93003ffcb9ee94b1..1a4b8693d271d63f32eebb49365f788d94532cd6 100755
--- a/hook/find-collisions.py
+++ b/hook/find-collisions.py
@@ -22,7 +22,7 @@ db.execute("""
         JOIN zoom_schedule s ON s.mid = m.mid
     WHERE
         s.start_time >= NOW()
-    ORDER BY u.uid, s.start_time
+    ORDER BY u.uid, s.start_time, m.mid
     """)
 
 class Meeting: