diff --git a/components/Timetable.vue b/components/Timetable.vue
index 78faac4..9ab9412 100644
--- a/components/Timetable.vue
+++ b/components/Timetable.vue
@@ -226,7 +226,7 @@ function junctionsFromEdges(edges: Iterable<Edge>) {
 			junctions.set(ts, { ts, edges: [edge] });
 		}
 	}
-	const keys = [...junctions.keys()].sort();
+	const keys = [...junctions.keys()].sort((a, b) => a - b);
 	return keys.map(key => junctions.get(key)!);
 }