diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/PromisedValue.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/PromisedValue.kt
index 36e5eeebc7c..2b04dcdac52 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/PromisedValue.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/PromisedValue.kt
@@ -11,6 +11,7 @@ import org.jetbrains.kotlin.backend.jvm.ir.erasedUpperBound
 import org.jetbrains.kotlin.backend.jvm.lower.inlineclasses.InlineClassAbi
 import org.jetbrains.kotlin.codegen.AsmUtil
 import org.jetbrains.kotlin.codegen.StackValue
+import org.jetbrains.kotlin.ir.descriptors.toIrBasedKotlinType
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.parentAsClass
 import org.jetbrains.kotlin.resolve.jvm.AsmTypes
@@ -42,12 +43,12 @@ abstract class PromisedValue(val codegen: ExpressionCodegen, val type: Type, val
 
             when {
                 isFromTypeUnboxed && !isToTypeUnboxed -> {
-                    StackValue.boxInlineClass(erasedSourceType.toKotlinType(), mv)
+                    StackValue.boxInlineClass(erasedSourceType.toIrBasedKotlinType(), mv)
                     return
                 }
 
                 !isFromTypeUnboxed && isToTypeUnboxed -> {
-                    StackValue.unboxInlineClass(type, erasedTargetType.toKotlinType(), mv)
+                    StackValue.unboxInlineClass(type, erasedTargetType.toIrBasedKotlinType(), mv)
                     return
                 }
             }