diff --git a/src/main/java/com/davidorellana/bookingsystemrestapi/auth/security/jwt/OperationJwtImpl.java b/src/main/java/com/davidorellana/bookingsystemrestapi/auth/security/jwt/OperationJwtImpl.java
index 0a0a91b..0f423fb 100644
--- a/src/main/java/com/davidorellana/bookingsystemrestapi/auth/security/jwt/OperationJwtImpl.java
+++ b/src/main/java/com/davidorellana/bookingsystemrestapi/auth/security/jwt/OperationJwtImpl.java
@@ -13,7 +13,7 @@
 public class OperationJwtImpl implements OperationJwt {
 
     @Value("${KEY_SECRET}")
-    private String keySecret;
+    private String KEY_SECRET;
 
     private final Integer MINUTES_JWT_EXPIRATION = 30;
 
@@ -25,7 +25,7 @@ public String generateJwt(User user, Calendar expirationDate) {
                 .claim("name", user.getName())
                 .setIssuedAt(new Date())
                 .setExpiration(expirationDate.getTime())
-                .signWith(SignatureAlgorithm.HS256, keySecret)
+                .signWith(SignatureAlgorithm.HS256, KEY_SECRET)
                 .compact();
     }
 
@@ -46,7 +46,7 @@ public Boolean validateJwt(String jwt, User user) {
     @Override
     public Claims returnClaims(String jwt) {
         return Jwts.parser()
-                .setSigningKey(keySecret)
+                .setSigningKey(KEY_SECRET)
                 .parseClaimsJws(jwt)
                 .getBody();
     }
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 5b300c2..0069e22 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -5,3 +5,4 @@ logging.level.org.springframework.data.mongodb.core.MongoTemplate=DEBUG
 logging.level.org.springframework.data.mongodb.repository.Query=DEBUG
 spring.data.mongodb.auto-index-creation=true
 spring.mvc.pathmatch.matching-strategy=ant_path_matcher
+KEY_SECRET=${KEY_SECRET}