diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrConstantObject.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrConstantObject.kt
index 68befcbfdf3..cb0e23b6a06 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrConstantObject.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrConstantObject.kt
@@ -19,12 +19,10 @@ abstract class IrConstantPrimitive : IrConstantValue() {
 
 abstract class IrConstantObject : IrConstantValue() {
     abstract val constructor: IrConstructorSymbol
-    abstract val valueArguments: List<IrConstantValue>
+    abstract val valueArguments: MutableList<IrConstantValue>
     abstract val typeArguments: List<IrType>
-    abstract fun putArgument(index: Int, value: IrConstantValue)
 }
 
 abstract class IrConstantArray : IrConstantValue() {
-    abstract val elements: List<IrConstantValue>
-    abstract fun putElement(index: Int, value: IrConstantValue)
+    abstract val elements: MutableList<IrConstantValue>
 }
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/impl/IrConstantObjectImpl.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/impl/IrConstantObjectImpl.kt
index a4f132c0714..bbcdc1d81fc 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/impl/IrConstantObjectImpl.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/impl/IrConstantObjectImpl.kt
@@ -7,7 +7,6 @@ package org.jetbrains.kotlin.ir.expressions.impl
 
 import org.jetbrains.kotlin.ir.expressions.*
 import org.jetbrains.kotlin.ir.symbols.IrConstructorSymbol
-import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.util.constructedClassType
 import org.jetbrains.kotlin.ir.util.transformInPlace
@@ -58,10 +57,6 @@ class IrConstantObjectImpl constructor(
         return visitor.visitConstantObject(this, data)
     }
 
-    override fun putArgument(index: Int, value: IrConstantValue) {
-        valueArguments[index] = value
-    }
-
     override fun contentEquals(other: IrConstantValue): Boolean =
         other is IrConstantObject &&
                 other.type == type &&
@@ -99,9 +94,6 @@ class IrConstantArrayImpl(
     initElements: List<IrConstantValue>,
 ) : IrConstantArray() {
     override val elements = SmartList(initElements)
-    override fun putElement(index: Int, value: IrConstantValue) {
-        elements[index] = value
-    }
 
     override fun contentEquals(other: IrConstantValue): Boolean =
         other is IrConstantArray &&
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/common/AbstractValueUsageTransformer.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/common/AbstractValueUsageTransformer.kt
index 0c3c9b61b43..3cbebaf52a7 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/common/AbstractValueUsageTransformer.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/common/AbstractValueUsageTransformer.kt
@@ -21,8 +21,6 @@ import org.jetbrains.kotlin.ir.util.defaultType
 import org.jetbrains.kotlin.ir.util.render
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
-import java.lang.IllegalStateException
-
 
 /**
  * Transforms expressions depending on the context they are used in.
@@ -281,7 +279,7 @@ internal abstract class AbstractValueUsageTransformer(
                     ?: throw IllegalStateException("Unexpected array type ${expression.type.render()}")
 
         expression.elements.forEachIndexed { index, it ->
-            expression.putElement(index, it.useAs(elementType) as IrConstantValue)
+            expression.elements[index] = it.useAs(elementType) as IrConstantValue
         }
         return expression
     }
@@ -290,7 +288,7 @@ internal abstract class AbstractValueUsageTransformer(
         expression.transformChildrenVoid(this)
 
         expression.valueArguments.forEachIndexed { index, arg ->
-            expression.putArgument(index, arg.useAsArgument(expression.constructor.owner.valueParameters[index]) as IrConstantValue)
+            expression.valueArguments[index] = arg.useAsArgument(expression.constructor.owner.valueParameters[index]) as IrConstantValue
         }
         return expression
     }
@@ -298,4 +296,3 @@ internal abstract class AbstractValueUsageTransformer(
     // TODO: IrStringConcatenation, IrEnumEntry?
 
 }
-