diff --git a/backend/src/main/java/com/openisle/service/NotificationService.java b/backend/src/main/java/com/openisle/service/NotificationService.java
index 40c48bc9f..9fbc595f2 100644
--- a/backend/src/main/java/com/openisle/service/NotificationService.java
+++ b/backend/src/main/java/com/openisle/service/NotificationService.java
@@ -10,8 +10,8 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.springframework.transaction.annotation.Transactional;
-+import org.springframework.transaction.support.TransactionSynchronization;
-+import org.springframework.transaction.support.TransactionSynchronizationManager;
+import org.springframework.transaction.support.TransactionSynchronization;
+import org.springframework.transaction.support.TransactionSynchronizationManager;
 import java.util.Map;
 
 import java.util.regex.Pattern;