diff --git a/core/src/main/java/com/github/gumtreediff/matchers/CompositeMatchers.java b/core/src/main/java/com/github/gumtreediff/matchers/CompositeMatchers.java
index 0234f9881..e4259b53a 100644
--- a/core/src/main/java/com/github/gumtreediff/matchers/CompositeMatchers.java
+++ b/core/src/main/java/com/github/gumtreediff/matchers/CompositeMatchers.java
@@ -56,7 +56,7 @@ public CompleteGumtreeMatche(ITree src, ITree dst, MappingStore store) {
     }
 
     @Register(id = "change-distiller", defaultMatcher = true)
-    public class ChangeDistiller extends CompositeMatcher {
+    public static class ChangeDistiller extends CompositeMatcher {
 
         public ChangeDistiller(ITree src, ITree dst, MappingStore store) {
             super(src, dst, store, new Matcher[]{