diff --git a/src/main/java/nutshell/server/repository/TimeBlockRepository.java b/src/main/java/nutshell/server/repository/TimeBlockRepository.java
index abf597f..e23b464 100644
--- a/src/main/java/nutshell/server/repository/TimeBlockRepository.java
+++ b/src/main/java/nutshell/server/repository/TimeBlockRepository.java
@@ -14,8 +14,8 @@
 public interface TimeBlockRepository extends JpaRepository<TimeBlock, Long> {
     @Query(value="select count(t) > 0 from TimeBlock t " +
             "where t.task.user = :user and " +
-            "t.startTime between :startTime and :endTime or " +
-            "t.endTime between :startTime and :endTime"
+            "(t.startTime between :startTime and :endTime or " +
+            "t.endTime between :startTime and :endTime)"
             )
     Boolean existsByTaskUserAndStartTimeBetweenAndEndTimeBetween(
             final User user,
@@ -26,8 +26,8 @@ Boolean existsByTaskUserAndStartTimeBetweenAndEndTimeBetween(
     @Query(value="select count(t) > 0 from TimeBlock t " +
             "where t.task.user = :user and " +
             "t.id != :id and " +
-            "t.startTime between :startTime and :endTime or " +
-            "t.endTime between :startTime and :endTime"
+            "(t.startTime between :startTime and :endTime or " +
+            "t.endTime between :startTime and :endTime)"
     )
     Boolean existsByTaskAndStartTimeBetweenAndEndTimeBetweenAndIdNot(
             final User user,