diff --git a/backend/order/src/main/java/org/samtuap/inong/domain/coupon/entity/Coupon.java b/backend/order/src/main/java/org/samtuap/inong/domain/coupon/entity/Coupon.java
index ebb6e6c9..327c1d32 100644
--- a/backend/order/src/main/java/org/samtuap/inong/domain/coupon/entity/Coupon.java
+++ b/backend/order/src/main/java/org/samtuap/inong/domain/coupon/entity/Coupon.java
@@ -47,7 +47,7 @@ public void decreaseQuantity() {
             // 무제한 발급이므로 수량을 감소시키지 않음
             return;
         }
-        if (this.quantity <= 0) {
+        if (this.quantity == 0) {
             throw new BaseCustomException(COUPON_SOLD_OUT);
         }
         this.quantity--;
diff --git a/backend/order/src/main/java/org/samtuap/inong/domain/coupon/repository/CouponRedisRepository.java b/backend/order/src/main/java/org/samtuap/inong/domain/coupon/repository/CouponRedisRepository.java
index b86a2d62..9b17bbff 100644
--- a/backend/order/src/main/java/org/samtuap/inong/domain/coupon/repository/CouponRedisRepository.java
+++ b/backend/order/src/main/java/org/samtuap/inong/domain/coupon/repository/CouponRedisRepository.java
@@ -1,11 +1,14 @@
 package org.samtuap.inong.domain.coupon.repository;
 
 import lombok.RequiredArgsConstructor;
+import org.samtuap.inong.common.exception.BaseCustomException;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Repository;
 
 import java.util.Set;
 
+import static org.samtuap.inong.common.exceptionType.CouponExceptionType.COUPON_SOLD_OUT;
+
 @Repository
 @RequiredArgsConstructor
 public class CouponRedisRepository {
@@ -24,6 +27,9 @@ public void createCoupon(Long couponId, int quantity) {
     public Long decreaseCouponQuantity(Long couponId) {
         String key = getCouponQuantityKey(couponId);
         String currentValue = redisTemplate.opsForValue().get(key);
+        if("0".equals(currentValue)) {
+            throw new BaseCustomException(COUPON_SOLD_OUT);
+        }
         if ("-1".equals(currentValue)) {
             return -1L;
         }