diff --git a/app/src/main/java/com/techcourse/service/AppUserService.java b/app/src/main/java/com/techcourse/service/AppUserService.java
index bc7bd65554..a8d453b094 100644
--- a/app/src/main/java/com/techcourse/service/AppUserService.java
+++ b/app/src/main/java/com/techcourse/service/AppUserService.java
@@ -8,7 +8,7 @@
 public class AppUserService implements UserService {
 
     private final UserDao userDao;
-    final UserHistoryDao userHistoryDao;
+    private final UserHistoryDao userHistoryDao;
 
     public AppUserService(final UserDao userDao, final UserHistoryDao userHistoryDao) {
         this.userDao = userDao;