diff --git a/src/test/java/com/puppycrawl/tools/checkstyle/TestUtils.java b/src/test/java/com/puppycrawl/tools/checkstyle/TestUtils.java
index 62166bb61..d82fb8986 100644
--- a/src/test/java/com/puppycrawl/tools/checkstyle/TestUtils.java
+++ b/src/test/java/com/puppycrawl/tools/checkstyle/TestUtils.java
@@ -24,7 +24,7 @@ import java.lang.reflect.Modifier;
 
 import org.junit.Assert;
 
-public class TestUtils {
+public final class TestUtils {
 
     private TestUtils() {
     }