diff --git a/powerauth-java-server/src/main/java/com/wultra/security/powerauth/app/server/service/behavior/tasks/CallbackUrlBehavior.java b/powerauth-java-server/src/main/java/com/wultra/security/powerauth/app/server/service/behavior/tasks/CallbackUrlBehavior.java
index 40c0960f6..29563018f 100644
--- a/powerauth-java-server/src/main/java/com/wultra/security/powerauth/app/server/service/behavior/tasks/CallbackUrlBehavior.java
+++ b/powerauth-java-server/src/main/java/com/wultra/security/powerauth/app/server/service/behavior/tasks/CallbackUrlBehavior.java
@@ -519,7 +519,7 @@ private boolean isMaxAttemptsPositive(final CallbackUrlEntity callbackUrlEntity)
      */
     private void validateAuthenticationConfigRequest(HttpAuthenticationPrivate authentication, String callbackUrl) throws GenericServiceException {
         if (authentication != null && authentication.getCertificate() != null) {
-            HttpAuthenticationPrivate.Certificate certificate = authentication.getCertificate();
+            final HttpAuthenticationPrivate.Certificate certificate = authentication.getCertificate();
 
             if (certificate.isUseCustomKeyStore() &&
                     StringUtils.hasText(certificate.getKeyStoreLocation()) &&