diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt
index 30b20d6845e..04f4a7d8f0e 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt
@@ -305,6 +305,11 @@ fun IrDeclarationContainer.addChild(declaration: IrDeclaration) {
     declaration.accept(SetDeclarationsParentVisitor, this)
 }
 
+fun <T: IrElement> T.setDeclarationsParent(parent: IrDeclarationParent): T {
+    accept(SetDeclarationsParentVisitor, parent)
+    return this
+}
+
 object SetDeclarationsParentVisitor : IrElementVisitor<Unit, IrDeclarationParent> {
     override fun visitElement(element: IrElement, data: IrDeclarationParent) {
         if (element !is IrDeclarationParent) {
diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/SharedVariablesLowering.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/SharedVariablesLowering.kt
index 60b566239a0..aba5d32561e 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/SharedVariablesLowering.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/SharedVariablesLowering.kt
@@ -86,6 +86,7 @@ class SharedVariablesLowering(val context: BackendContext) : FunctionLoweringPas
                     if (declaration !in sharedVariables) return declaration
 
                     val newDeclaration = context.sharedVariablesManager.declareSharedVariable(declaration)
+                    newDeclaration.parent = irFunction
                     transformedDescriptors[declaration.symbol] = newDeclaration.symbol
 
                     return context.sharedVariablesManager.defineSharedValue(declaration, newDeclaration)
diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/TailrecLowering.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/TailrecLowering.kt
index 17f4fc619d8..5030b937fd6 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/TailrecLowering.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/TailrecLowering.kt
@@ -53,7 +53,7 @@ private fun lowerTailRecursionCalls(context: BackendContext, irFunction: IrFunct
     irFunction.body = builder.irBlockBody {
         // Define variables containing current values of parameters:
         val parameterToVariable = parameters.associate {
-            it to irTemporaryVar(irGet(it), nameHint = it.symbol.suggestVariableName(), parent = irFunction)
+            it to irTemporaryVar(irGet(it), nameHint = it.symbol.suggestVariableName())
         }
         // (these variables are to be updated on any tail call).
 
@@ -65,7 +65,7 @@ private fun lowerTailRecursionCalls(context: BackendContext, irFunction: IrFunct
                 // Read variables containing current values of parameters:
                 val parameterToNew = parameters.associate {
                     val variable = parameterToVariable[it]!!
-                    it to irTemporary(irGet(variable), nameHint = it.symbol.suggestVariableName()).also { it.parent = irFunction }
+                    it to irTemporary(irGet(variable), nameHint = it.symbol.suggestVariableName())
                 }
 
                 val transformer = BodyTransformer(
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt
index bef23603f44..e772fb8ec78 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt
@@ -18,6 +18,7 @@ import org.jetbrains.kotlin.ir.util.parentAsClass
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.utils.addToStdlib.assertedCast
 
+val IrBuilderWithScope.parent get() = scope.getLocalDeclarationParent()
 
 inline fun IrBuilderWithScope.irLet(
     value: IrExpression,
@@ -68,11 +69,9 @@ fun <T : IrElement> IrStatementsBuilder<T>.defineTemporary(value: IrExpression,
 fun <T : IrElement> IrStatementsBuilder<T>.irTemporaryVar(
     value: IrExpression,
     nameHint: String? = null,
-    typeHint: KotlinType? = null,
-    parent: IrDeclarationParent? = null
+    typeHint: KotlinType? = null
 ): IrVariable {
     val temporary = scope.createTemporaryVariable(value, nameHint, isMutable = true, type = typeHint)
-    parent?.let { temporary.parent = it }
     +temporary
     return temporary
 }
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/Scope.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/Scope.kt
index 56a097548ec..421faa51ba4 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/Scope.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/Scope.kt
@@ -41,7 +41,7 @@ import org.jetbrains.kotlin.types.KotlinType
 class Scope(val scopeOwnerSymbol: IrSymbol) {
     val scopeOwner: DeclarationDescriptor get() = scopeOwnerSymbol.descriptor
 
-    private fun getVariableParent(): IrDeclarationParent {
+    fun getLocalDeclarationParent(): IrDeclarationParent {
         if (!scopeOwnerSymbol.isBound) throw AssertionError("Unbound symbol: $scopeOwner")
         val scopeOwnerElement = scopeOwnerSymbol.owner
         return when (scopeOwnerElement) {
@@ -87,7 +87,7 @@ class Scope(val scopeOwnerSymbol: IrSymbol) {
             irType ?: irExpression.type,
             irExpression
         ).apply {
-            parent = getVariableParent()
+            parent = getLocalDeclarationParent()
         }
     }
 }
diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/SerializerIrGenerator.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/SerializerIrGenerator.kt
index 5d57da867e0..0fbcafeb58b 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/SerializerIrGenerator.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/SerializerIrGenerator.kt
@@ -299,24 +299,23 @@ class SerializerIrGenerator(val irClass: IrClass, override val compilerContext:
         val localSerialDesc = irTemporary(irGet(descriptorGetterSymbol.owner.returnType, irThis(), descriptorGetterSymbol), "desc")
 
         // workaround due to unavailability of labels (KT-25386)
-        val flagVar = irTemporaryVar(irBoolean(true), "flag", parent = loadFunc)
+        val flagVar = irTemporaryVar(irBoolean(true), "flag")
 
-        val indexVar = irTemporaryVar(irInt(0), "index", parent = loadFunc)
+        val indexVar = irTemporaryVar(irInt(0), "index")
 //        val readAll = irTemporaryVar(irBoolean(false), "readAll", parent = loadFunc)
 //
         // calculating bit mask vars
         val blocksCnt = orderedProperties.size / 32 + 1
 
         // var bitMask0 = 0, bitMask1 = 0...
-        val bitMasks = (0 until blocksCnt).map { irTemporaryVar(irInt(0), "bitMask$it", parent = loadFunc) }
+        val bitMasks = (0 until blocksCnt).map { irTemporaryVar(irInt(0), "bitMask$it") }
         // var local0 = null, local1 = null ...
         val localProps = orderedProperties.mapIndexed { i, prop ->
             val (expr, type) = defaultValueAndType(prop)
             irTemporaryVar(
                 expr,
                 "local$i",
-                typeHint = type,
-                parent = loadFunc
+                typeHint = type
             )
         }