diff --git a/src/main/java/roomescape/reservation/business/ReservationService.kt b/src/main/java/roomescape/reservation/business/ReservationService.kt
index f93c7eb3..1047b9c7 100644
--- a/src/main/java/roomescape/reservation/business/ReservationService.kt
+++ b/src/main/java/roomescape/reservation/business/ReservationService.kt
@@ -201,7 +201,7 @@ class ReservationService(
 
     fun approveWaiting(reservationId: Long, memberId: Long) {
         validateIsMemberAdmin(memberId)
-        if (reservationRepository. isExistConfirmedReservation(reservationId)) {
+        if (reservationRepository.isExistConfirmedReservation(reservationId)) {
             throw RoomescapeException(ErrorType.RESERVATION_DUPLICATED, HttpStatus.CONFLICT)
         }
         reservationRepository.updateStatusByReservationId(reservationId, ReservationStatus.CONFIRMED_PAYMENT_REQUIRED)
diff --git a/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt b/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt
index c14602b1..5d17d47a 100644
--- a/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt
+++ b/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt
@@ -28,11 +28,17 @@ interface ReservationRepository
     @Query("""
 		SELECT EXISTS (
             SELECT 1
-            FROM ReservationEntity r
-            WHERE r.id = :id
-                AND r.reservationStatus != 'WAITING'
-		)
-		""")
+            FROM ReservationEntity r2
+            WHERE r2.id = :id 
+              AND EXISTS (   
+                  SELECT 1 FROM ReservationEntity r
+                  WHERE r.theme.id = r2.theme.id
+                    AND r.reservationTime.id = r2.reservationTime.id
+                    AND r.date = r2.date
+                    AND r.reservationStatus != 'WAITING'
+            ) 
+        )
+	""")
     fun isExistConfirmedReservation(@Param("id") reservationId: Long): Boolean
 
     @Query("""