diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt
index 810b3e0d650..e9a7cf578a9 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt
@@ -240,7 +240,9 @@ internal class FunctionInlining(val context: Context): IrElementTransformerVoid(
             val operandTypeDescriptor = newExpression.typeOperand.constructor.declarationDescriptor
             if (operandTypeDescriptor !is TypeParameterDescriptor) return newExpression        // It is not TypeParameter - do nothing
 
-            val typeNew         = typeArgsMap[operandTypeDescriptor]!!
+            var typeNew         = typeArgsMap[operandTypeDescriptor]!!
+            if (newExpression.typeOperand.isMarkedNullable)
+                typeNew = typeNew.makeNullable()
             val startOffset     = newExpression.startOffset
             val endOffset       = newExpression.endOffset
             val operator        = newExpression.operator