diff --git a/src/main/java/ku_rum/backend/domain/bookmark/application/BookmarkService.java b/src/main/java/ku_rum/backend/domain/bookmark/application/BookmarkService.java
index 31a4cc9f..91d276ff 100644
--- a/src/main/java/ku_rum/backend/domain/bookmark/application/BookmarkService.java
+++ b/src/main/java/ku_rum/backend/domain/bookmark/application/BookmarkService.java
@@ -73,8 +73,8 @@ private void validateDuplicateBookmark(User user, Notice notice) {
     }
 
     private void validateBookmarkAuthorization(User user, NoticeBookmark noticeBookmark) {
-        Long noticeId = noticeBookmark.getUser().getId();
-        if (noticeId.equals(user.getId())) {
+        Long noticeUserId = noticeBookmark.getUser().getId();
+        if (!noticeUserId.equals(user.getId())) {
             throw new GlobalException(UNAUTHORIZED_BOOKMARK);
         }
     }