diff --git a/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmGeneratorExtensionsImpl.kt b/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmGeneratorExtensionsImpl.kt
index cc92c7d59d0..090c544750f 100644
--- a/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmGeneratorExtensionsImpl.kt
+++ b/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmGeneratorExtensionsImpl.kt
@@ -118,7 +118,9 @@ open class JvmGeneratorExtensionsImpl(
         allowErrorNodes: Boolean
     ): Boolean {
         val serializedIr = (irClass.source as? KotlinJvmBinarySourceElement)?.binaryClass?.classHeader?.serializedIr ?: return false
-        deserializeClassFromByteArray(serializedIr, stubGenerator, irClass, allowErrorNodes)
+        deserializeClassFromByteArray(
+            serializedIr, stubGenerator, irClass, JvmIrTypeSystemContext(stubGenerator.irBuiltIns), allowErrorNodes
+        )
         irClass.transform(SingletonObjectJvmStaticTransformer(stubGenerator.irBuiltIns, cachedFields), null)
         return true
     }
@@ -130,7 +132,9 @@ open class JvmGeneratorExtensionsImpl(
         allowErrorNodes: Boolean
     ): Boolean {
         val serializedIr = (irClass.source as? JvmPackagePartSource)?.knownJvmBinaryClass?.classHeader?.serializedIr ?: return false
-        deserializeIrFileFromByteArray(serializedIr, stubGenerator, irClass, allowErrorNodes)
+        deserializeIrFileFromByteArray(
+            serializedIr, stubGenerator, irClass, JvmIrTypeSystemContext(stubGenerator.irBuiltIns), allowErrorNodes
+        )
         irClass.transform(SingletonObjectJvmStaticTransformer(stubGenerator.irBuiltIns, cachedFields), null)
         return true
     }
diff --git a/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/JvmIrSerializerSession.kt b/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/JvmIrSerializerSession.kt
index 0f47f13f8d9..1e562c059fd 100644
--- a/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/JvmIrSerializerSession.kt
+++ b/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/JvmIrSerializerSession.kt
@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.backend.jvm.serialization
 
+import org.jetbrains.kotlin.backend.common.serialization.CompatibilityMode
 import org.jetbrains.kotlin.backend.common.serialization.DeclarationTable
 import org.jetbrains.kotlin.backend.common.serialization.IrFileSerializer
 import org.jetbrains.kotlin.backend.jvm.serialization.proto.JvmIr
@@ -21,7 +22,9 @@ class JvmIrSerializerSession(
     expectDescriptorToSymbol: MutableMap<DeclarationDescriptor, IrSymbol>,
     externallyVisibleOnly: Boolean = true,
     skipExpects: Boolean = false,
-) : IrFileSerializer(messageLogger, declarationTable, expectDescriptorToSymbol, externallyVisibleOnly, skipExpects) {
+) : IrFileSerializer(
+    messageLogger, declarationTable, expectDescriptorToSymbol, CompatibilityMode.CURRENT, externallyVisibleOnly, skipExpects
+) {
 
     // Usage protocol: construct an instance, call only one of `serializeIrFile()` and `serializeTopLevelClass()` only once.
 
diff --git a/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/deserializeLazyDeclarations.kt b/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/deserializeLazyDeclarations.kt
index 84e729eb382..ad3663096c0 100644
--- a/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/deserializeLazyDeclarations.kt
+++ b/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/backend/jvm/serialization/deserializeLazyDeclarations.kt
@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.ir.declarations.lazy.LazyIrFactory
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.symbols.impl.IrFileSymbolImpl
+import org.jetbrains.kotlin.ir.types.IrTypeSystemContext
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
@@ -31,6 +32,7 @@ fun deserializeClassFromByteArray(
     byteArray: ByteArray,
     stubGenerator: DeclarationStubGenerator,
     irClass: IrClass,
+    typeSystemContext: IrTypeSystemContext,
     allowErrorNodes: Boolean,
 ) {
     val irBuiltIns = stubGenerator.irBuiltIns
@@ -73,19 +75,21 @@ fun deserializeClassFromByteArray(
         deserializeBodies = true,
         symbolDeserializer,
         DefaultFakeOverrideClassFilter,
-        makeSimpleFakeOverrideBuilder(symbolTable, irBuiltIns, symbolDeserializer)
+        makeSimpleFakeOverrideBuilder(symbolTable, typeSystemContext, symbolDeserializer),
+        compatibilityMode = CompatibilityMode.CURRENT,
     )
 
     deserializer.deserializeIrClass(irProto.irClass)
 
     ExternalDependenciesGenerator(stubGenerator.symbolTable, listOf(stubGenerator)).generateUnboundSymbolsAsDependencies()
-    buildFakeOverridesForLocalClasses(stubGenerator.symbolTable, stubGenerator.irBuiltIns, symbolDeserializer, irClass)
+    buildFakeOverridesForLocalClasses(stubGenerator.symbolTable, typeSystemContext, symbolDeserializer, irClass)
 }
 
 fun deserializeIrFileFromByteArray(
     byteArray: ByteArray,
     stubGenerator: DeclarationStubGenerator,
     facadeClass: IrClass,
+    typeSystemContext: IrTypeSystemContext,
     allowErrorNodes: Boolean,
 ) {
     val irBuiltIns = stubGenerator.irBuiltIns
@@ -121,7 +125,7 @@ fun deserializeIrFileFromByteArray(
 
     val lazyIrFactory = LazyIrFactory(irBuiltIns.irFactory)
 
-    val fakeOverrideBuilder = makeSimpleFakeOverrideBuilder(symbolTable, irBuiltIns, symbolDeserializer)
+    val fakeOverrideBuilder = makeSimpleFakeOverrideBuilder(symbolTable, typeSystemContext, symbolDeserializer)
 
     val deserializer = IrDeclarationDeserializer(
         irBuiltIns, symbolTable, lazyIrFactory, irLibraryFile, facadeClass,
@@ -130,14 +134,15 @@ fun deserializeIrFileFromByteArray(
         deserializeBodies = true,
         symbolDeserializer,
         DefaultFakeOverrideClassFilter,
-        fakeOverrideBuilder
+        fakeOverrideBuilder,
+        compatibilityMode = CompatibilityMode.CURRENT,
     )
     for (declarationProto in irProto.declarationList) {
         deserializer.deserializeDeclaration(declarationProto)
     }
 
     ExternalDependenciesGenerator(stubGenerator.symbolTable, listOf(stubGenerator)).generateUnboundSymbolsAsDependencies()
-    buildFakeOverridesForLocalClasses(stubGenerator.symbolTable, stubGenerator.irBuiltIns, symbolDeserializer, facadeClass)
+    buildFakeOverridesForLocalClasses(stubGenerator.symbolTable, typeSystemContext, symbolDeserializer, facadeClass)
 }
 
 private class IrLibraryFileFromAnnotation(
@@ -195,7 +200,7 @@ private fun referencePublicSymbol(
 // TODO: implement properly
 fun makeSimpleFakeOverrideBuilder(
     symbolTable: SymbolTable,
-    irBuiltIns: IrBuiltIns,
+    typeSystemContext: IrTypeSystemContext,
     symbolDeserializer: IrSymbolDeserializer
 ): FakeOverrideBuilder {
     return FakeOverrideBuilder(
@@ -210,18 +215,18 @@ fun makeSimpleFakeOverrideBuilder(
         },
         symbolTable,
         JvmIrMangler,
-        irBuiltIns,
+        typeSystemContext,
         fakeOverrideDeclarationTable = PrePopulatedDeclarationTable(symbolDeserializer.deserializedSymbols)
     )
 }
 
 private fun buildFakeOverridesForLocalClasses(
     symbolTable: SymbolTable,
-    irBuiltIns: IrBuiltIns,
+    typeSystemContext: IrTypeSystemContext,
     symbolDeserializer: IrSymbolDeserializer,
     toplevel: IrClass
 ) {
-    val builder = makeSimpleFakeOverrideBuilder(symbolTable, irBuiltIns, symbolDeserializer)
+    val builder = makeSimpleFakeOverrideBuilder(symbolTable, typeSystemContext, symbolDeserializer)
     toplevel.acceptChildrenVoid(object : IrElementVisitorVoid {
         override fun visitElement(element: IrElement) {
             element.acceptChildrenVoid(this)
@@ -229,7 +234,7 @@ private fun buildFakeOverridesForLocalClasses(
 
         override fun visitClass(declaration: IrClass) {
             if (declaration.visibility == DescriptorVisibilities.LOCAL) {
-                builder.provideFakeOverrides(declaration)
+                builder.provideFakeOverrides(declaration, CompatibilityMode.CURRENT)
             }
             super.visitClass(declaration)
         }