diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/KotlinMangler.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/KotlinMangler.kt
index 03ebe94d494..891380ae875 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/KotlinMangler.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/KotlinMangler.kt
@@ -21,7 +21,7 @@ interface KotlinMangler {
     val IrDeclaration.hashedMangle: Long
     fun IrDeclaration.isExported(): Boolean
     val IrFunction.functionName: String
-
+    val IrType.isInlined: Boolean
 }
 
 abstract class KotlinManglerImpl: KotlinMangler {
@@ -155,7 +155,7 @@ abstract class KotlinManglerImpl: KotlinMangler {
             val signatureSuffix =
                 when {
                     this.typeParameters.isNotEmpty() -> "Generic"
-                    returnType.isInlined() -> "ValueType"
+                    returnType.isInlined -> "ValueType"
                     !returnType.isUnitOrNullableUnit() -> typeToHashString(returnType)
                     else -> ""
                 }
diff --git a/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsMangler.kt b/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsMangler.kt
index ca7d67c8b62..7e8fdd80fc3 100644
--- a/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsMangler.kt
+++ b/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsMangler.kt
@@ -6,9 +6,14 @@
 package org.jetbrains.kotlin.ir.backend.js.lower.serialization.ir
 
 import org.jetbrains.kotlin.backend.common.serialization.KotlinManglerImpl
+import org.jetbrains.kotlin.ir.types.IrType
+import org.jetbrains.kotlin.ir.util.isInlined
 
 object JsMangler: KotlinManglerImpl() {
     // TODO: think about this
     override val String.hashMangle: Long get() = this.hashCode().toLong()
+
+    override val IrType.isInlined: Boolean
+        get() = this.isInlined()
 }