diff --git a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RulesProperties.java b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RulesProperties.java
index d5b18e9..1e17e36 100644
--- a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RulesProperties.java
+++ b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RulesProperties.java
@@ -20,5 +20,8 @@ import java.util.List;
 @ConfigurationProperties
 class RulesProperties {
 
-    public List<Rule> rules;
+    /**
+     * The Checkstyle checks.
+     */
+    private List<Rule> rules;
 }