diff --git a/j2k/newSrc/org/jetbrains/kotlin/j2k/tree/impl/base.kt b/j2k/newSrc/org/jetbrains/kotlin/j2k/tree/impl/base.kt
index 46d8eff56d2..98a2025f0d3 100644
--- a/j2k/newSrc/org/jetbrains/kotlin/j2k/tree/impl/base.kt
+++ b/j2k/newSrc/org/jetbrains/kotlin/j2k/tree/impl/base.kt
@@ -85,7 +85,7 @@ abstract class JKBranchElementBase : JKElementBase(), JKBranchElement {
         return JKListChild(childNum++)
     }
 
-    override fun <D> acceptChildren(visitor: JKVisitor<Unit, D>, data: D) {
+    final override fun <D> acceptChildren(visitor: JKVisitor<Unit, D>, data: D) {
         children.forEach {
             if (it is JKTreeElement)
                 it.accept(visitor, data)