diff --git a/src/main/java/com/thirdparty/ticketing/domain/ticket/service/proxy/LettuceReservationServiceProxy.java b/src/main/java/com/thirdparty/ticketing/domain/ticket/service/proxy/LettuceReservationServiceProxy.java
index d292dff2..266b8737 100644
--- a/src/main/java/com/thirdparty/ticketing/domain/ticket/service/proxy/LettuceReservationServiceProxy.java
+++ b/src/main/java/com/thirdparty/ticketing/domain/ticket/service/proxy/LettuceReservationServiceProxy.java
@@ -19,8 +19,9 @@ private void performSeatAction(String seatId, Runnable action) {
         int retryLimit = 5;
         int sleepDuration = 300;
         String lockPrefix = "seat:";
+        String lockKey = lockPrefix + seatId;
         try {
-            while (retryLimit > 0 && !lettuceRepository.seatLock(lockPrefix + seatId)) {
+            while (retryLimit > 0 && !lettuceRepository.seatLock(lockKey)) {
                 retryLimit -= 1;
                 Thread.sleep(sleepDuration);
             }
@@ -34,7 +35,7 @@ private void performSeatAction(String seatId, Runnable action) {
         } catch (InterruptedException e) {
             throw new TicketingException(ErrorCode.NOT_SELECTABLE_SEAT, e);
         } finally {
-            lettuceRepository.unlock(seatId);
+            lettuceRepository.unlock(lockKey);
         }
     }