diff --git a/jkube-kit/common/src/main/java/org/eclipse/jkube/kit/common/util/validator/ResourceValidator.java b/jkube-kit/common/src/main/java/org/eclipse/jkube/kit/common/util/validator/ResourceValidator.java
index ad1b74a3ab..59114485fe 100644
--- a/jkube-kit/common/src/main/java/org/eclipse/jkube/kit/common/util/validator/ResourceValidator.java
+++ b/jkube-kit/common/src/main/java/org/eclipse/jkube/kit/common/util/validator/ResourceValidator.java
@@ -210,7 +210,7 @@ static List<NonValidationKeyword> createNonValidationKeywordList() {
 
     private static class ConstraintViolationImpl implements ConstraintViolation<ValidationMessage> {
 
-        private ValidationMessage errorMsg;
+        private final ValidationMessage errorMsg;
 
         public ConstraintViolationImpl(ValidationMessage errorMsg) {
             this.errorMsg = errorMsg;