diff --git a/pom.xml b/pom.xml
index f5bd825..c92995b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,6 +21,9 @@
         <junit.version>6.0.3</junit.version>
         <enforcer.version>3.6.2</enforcer.version>
 
+        <sonar.sources>.</sonar.sources>
+        <sonar.tests>src/test</sonar.tests>
+        <sonar.exclusions>src/test/**</sonar.exclusions>
         <sonar.organization>solubris</sonar.organization>
         <sonar.projectKey>solubris_coding-rules</sonar.projectKey>
         <sonar.host.url>https://sonarcloud.io</sonar.host.url>
diff --git a/src/main/java/com/solubris/enforcer/PropertyUtil.java b/src/main/java/com/solubris/enforcer/PropertyUtil.java
index 59ed528..a7ad584 100644
--- a/src/main/java/com/solubris/enforcer/PropertyUtil.java
+++ b/src/main/java/com/solubris/enforcer/PropertyUtil.java
@@ -1,6 +1,9 @@
 package com.solubris.enforcer;
 
 public class PropertyUtil {
+    private PropertyUtil() {
+    }
+
     public static String asPlaceHolder(String version) {
         return String.format("${%s}", version);
     }