diff --git a/src/services/search/note_set.js b/src/services/search/note_set.js
index 116c8eae2..82c236cf6 100644
--- a/src/services/search/note_set.js
+++ b/src/services/search/note_set.js
@@ -31,12 +31,7 @@ class NoteSet {
     }
 
     mergeIn(anotherNoteSet) {
-        for (const note of anotherNoteSet.notes) {
-            if (!this.noteIdSet.has(note.noteId)) {
-                this.noteIdSet.add(note.noteId);
-                this.notes.push(note);
-            }
-        }
+        this.addAll(anotherNoteSet.notes);
     }
 
     minus(anotherNoteSet) {