diff --git a/src/main/java/com/example/sinitto/guard/service/GuardService.java b/src/main/java/com/example/sinitto/guard/service/GuardService.java
index e620d930..b08fab92 100644
--- a/src/main/java/com/example/sinitto/guard/service/GuardService.java
+++ b/src/main/java/com/example/sinitto/guard/service/GuardService.java
@@ -90,7 +90,8 @@ public void updateSenior(Long memberId, Long seniorId, SeniorRequest seniorReque
                 () -> new NotFoundException("이메일에 해당하는 시니어를 찾을 수 없습니다.")
         );
 
-        if(seniorRepository.existsByPhoneNumber(seniorRequest.seniorPhoneNumber())) {
+        if(!senior.getPhoneNumber().equals(seniorRequest.seniorPhoneNumber())
+                && seniorRepository.existsByPhoneNumber(seniorRequest.seniorPhoneNumber())) {
             throw new BadRequestException("이미 등록되어 있는 전화번호 입니다.");
         }
 
diff --git a/src/test/java/com/example/sinitto/guard/service/GuardServiceTest.java b/src/test/java/com/example/sinitto/guard/service/GuardServiceTest.java
index d8dc017b..0c785010 100644
--- a/src/test/java/com/example/sinitto/guard/service/GuardServiceTest.java
+++ b/src/test/java/com/example/sinitto/guard/service/GuardServiceTest.java
@@ -184,6 +184,7 @@ void updateSeniorTest() {
         SeniorRequest request = new SeniorRequest("newSeniorName", "01011111111");
 
         when(seniorRepository.findByIdAndMemberId(seniorId, memberId)).thenReturn(Optional.of(senior));
+        when(senior.getPhoneNumber()).thenReturn("01012121212");
         //when
         guardService.updateSenior(memberId, seniorId, request);
 
@@ -203,6 +204,7 @@ void updateSeniorTestFailWhenDuplicatedPhoneNumber() {
 
         when(seniorRepository.findByIdAndMemberId(seniorId, memberId)).thenReturn(Optional.of(senior));
         when(seniorRepository.existsByPhoneNumber("01011111111")).thenReturn(true);
+        when(senior.getPhoneNumber()).thenReturn("01012121212");
         //when then
         assertThrows(BadRequestException.class, () -> guardService.updateSenior(memberId, seniorId, request));
     }