diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrScriptImpl.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrScriptImpl.kt
index 3f696b2f880..55b81b98806 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrScriptImpl.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrScriptImpl.kt
@@ -30,13 +30,7 @@ class IrScriptImpl(
 ) : IrScript() {
     override var origin: IrDeclarationOrigin = SCRIPT_ORIGIN
 
-    private var _parent: IrDeclarationParent? = null
-    override var parent: IrDeclarationParent
-        get() = _parent
-            ?: throw UninitializedPropertyAccessException("Parent not initialized: $this")
-        set(v) {
-            _parent = v
-        }
+    override lateinit var parent: IrDeclarationParent
 
     override var annotations: List<IrConstructorCall> = SmartList()
 
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrVariableImpl.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrVariableImpl.kt
index ddc84964a75..b7fc41e0280 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrVariableImpl.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrVariableImpl.kt
@@ -39,13 +39,7 @@ class IrVariableImpl(
     override var isConst: Boolean,
     override var isLateinit: Boolean
 ) : IrVariable() {
-    private var _parent: IrDeclarationParent? = null
-    override var parent: IrDeclarationParent
-        get() = _parent
-            ?: throw UninitializedPropertyAccessException("Parent not initialized: $this")
-        set(v) {
-            _parent = v
-        }
+    override lateinit var parent: IrDeclarationParent
 
     override var annotations: List<IrConstructorCall> = emptyList()