diff --git a/pmd-kotlin/src/main/java/net/sourceforge/pmd/cpd/KotlinTokenizer.java b/pmd-kotlin/src/main/java/net/sourceforge/pmd/cpd/KotlinTokenizer.java
index b4ee895e5f..af87b2f783 100644
--- a/pmd-kotlin/src/main/java/net/sourceforge/pmd/cpd/KotlinTokenizer.java
+++ b/pmd-kotlin/src/main/java/net/sourceforge/pmd/cpd/KotlinTokenizer.java
@@ -23,7 +23,7 @@ public class KotlinTokenizer extends AntlrTokenizer {
     }
 
     @Override
-    protected AntlrTokenFilter getTokenFilter(AntlrTokenManager tokenManager) {
+    protected AntlrTokenFilter getTokenFilter(final AntlrTokenManager tokenManager) {
         return new KotlinTokenFilter(tokenManager);
     }