diff --git a/compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/model/Element.kt b/compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/model/Element.kt
index e3c8153c778..16b51867fa1 100644
--- a/compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/model/Element.kt
+++ b/compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/model/Element.kt
@@ -56,8 +56,6 @@ class Element(name: String, override val propertyName: String, kind: Kind) : Abs
         }
     var _needTransformOtherChildren: Boolean = false
 
-    override var isSealed: Boolean = false
-
     override val hasAcceptMethod: Boolean
         get() = true
 
diff --git a/generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractElement.kt b/generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractElement.kt
index 852b46d980d..fcc382175b5 100644
--- a/generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractElement.kt
+++ b/generators/tree-generator-common/src/org/jetbrains/kotlin/generators/tree/AbstractElement.kt
@@ -35,8 +35,7 @@ abstract class AbstractElement<Element, Field>(
     val isRootElement: Boolean
         get() = elementParents.isEmpty()
 
-    open val isSealed: Boolean
-        get() = false
+    var isSealed: Boolean = false
 
     /**
      * The value of this property will be used to name a `visit*` method for this element in visitor classes.