diff --git a/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmIrCodegenFactory.kt b/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmIrCodegenFactory.kt
index a885ae57838..f2bfe5b23f1 100644
--- a/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmIrCodegenFactory.kt
+++ b/compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmIrCodegenFactory.kt
@@ -128,7 +128,7 @@ open class JvmIrCodegenFactory(
         val extensions: JvmGeneratorExtensions,
         val backendExtension: JvmBackendExtension,
         val pluginContext: IrPluginContext?,
-        val notifyCodegenStart: () -> Unit
+        val notifyCodegenStart: () -> Unit,
     ) : CodegenFactory.BackendInput
 
     private data class JvmIrCodegenInput(
@@ -317,11 +317,11 @@ open class JvmIrCodegenFactory(
 
         val moduleChunk = sourceFiles.toSet()
         val wholeModule = wholeBackendInput.irModuleFragment
-        return wholeBackendInput.copy(
-            IrModuleFragmentImpl(wholeModule.descriptor, wholeModule.irBuiltins, wholeModule.files.filter { file ->
-                file.getKtFile() in moduleChunk
-            })
-        )
+        val moduleCopy = IrModuleFragmentImpl(wholeModule.descriptor, wholeModule.irBuiltins)
+        wholeModule.files.filterTo(moduleCopy.files) { file ->
+            file.getKtFile() in moduleChunk
+        }
+        return wholeBackendInput.copy(moduleCopy)
     }
 
     override fun invokeLowerings(state: GenerationState, input: CodegenFactory.BackendInput): CodegenFactory.CodegenInput {
@@ -428,7 +428,7 @@ open class JvmIrCodegenFactory(
         extensions: JvmGeneratorExtensions,
         backendExtension: JvmBackendExtension,
         irPluginContext: IrPluginContext,
-        notifyCodegenStart: () -> Unit = {}
+        notifyCodegenStart: () -> Unit = {},
     ) {
         generateModule(
             state,
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrModuleFragmentImpl.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrModuleFragmentImpl.kt
index 4194cb9a45f..49ab71e8784 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrModuleFragmentImpl.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrModuleFragmentImpl.kt
@@ -26,7 +26,6 @@ import org.jetbrains.kotlin.name.Name
 class IrModuleFragmentImpl(
     override val descriptor: ModuleDescriptor,
     override val irBuiltins: IrBuiltIns,
-    files: List<IrFile> = emptyList(),
 ) : IrModuleFragment() {
     override val startOffset: Int
         get() = UNDEFINED_OFFSET
@@ -36,5 +35,5 @@ class IrModuleFragmentImpl(
 
     override val name: Name get() = descriptor.name
 
-    override val files: MutableList<IrFile> = files.toMutableList()
+    override val files: MutableList<IrFile> = ArrayList()
 }
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/BasicIrModuleDeserializer.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/BasicIrModuleDeserializer.kt
index f390b169062..e02d82fc37e 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/BasicIrModuleDeserializer.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/BasicIrModuleDeserializer.kt
@@ -96,7 +96,7 @@ abstract class BasicIrModuleDeserializer(
         error("No file for ${idSig.topLevelSignature()} (@ $idSig) in module $moduleDescriptor")
     }
 
-    override val moduleFragment: IrModuleFragment = IrModuleFragmentImpl(moduleDescriptor, linker.builtIns, emptyList())
+    override val moduleFragment: IrModuleFragment = IrModuleFragmentImpl(moduleDescriptor, linker.builtIns)
 
     private fun deserializeIrFile(
         fileProto: ProtoFile, file: IrFile, fileReader: IrLibraryFileFromBytes,
diff --git a/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsLazyIrModuleDeserializer.kt b/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsLazyIrModuleDeserializer.kt
index a80b64384f9..f3753d81bef 100644
--- a/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsLazyIrModuleDeserializer.kt
+++ b/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/lower/serialization/ir/JsLazyIrModuleDeserializer.kt
@@ -78,7 +78,7 @@ class JsLazyIrModuleDeserializer(
     }
 
 
-    override val moduleFragment: IrModuleFragment = IrModuleFragmentImpl(moduleDescriptor, builtIns, emptyList())
+    override val moduleFragment: IrModuleFragment = IrModuleFragmentImpl(moduleDescriptor, builtIns)
     override val moduleDependencies: Collection<IrModuleDeserializer> = dependencies
 
     override val kind get() = IrModuleDeserializerKind.SYNTHETIC
diff --git a/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/ir/backend/jvm/serialization/JvmIrLinker.kt b/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/ir/backend/jvm/serialization/JvmIrLinker.kt
index 4fc41c5a2cc..0ce492711f2 100644
--- a/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/ir/backend/jvm/serialization/JvmIrLinker.kt
+++ b/compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/ir/backend/jvm/serialization/JvmIrLinker.kt
@@ -171,7 +171,7 @@ class JvmIrLinker(
             }
         }
 
-        override val moduleFragment: IrModuleFragment = IrModuleFragmentImpl(moduleDescriptor, builtIns, emptyList())
+        override val moduleFragment: IrModuleFragment = IrModuleFragmentImpl(moduleDescriptor, builtIns)
         override val moduleDependencies: Collection<IrModuleDeserializer> = dependencies
 
         override val kind get() = IrModuleDeserializerKind.SYNTHETIC
diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/driver/phases/TopLevelPhases.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/driver/phases/TopLevelPhases.kt
index dfaa633499f..1709d346973 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/driver/phases/TopLevelPhases.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/driver/phases/TopLevelPhases.kt
@@ -198,7 +198,8 @@ private fun PhaseEngine<out Context>.splitIntoFragments(
                     containsStdlib = containsStdlib
             )
             val dependenciesTracker = DependenciesTrackerImpl(llvmModuleSpecification, context.config, context)
-            val fragment = IrModuleFragmentImpl(input.descriptor, input.irBuiltins, listOf(file))
+            val fragment = IrModuleFragmentImpl(input.descriptor, input.irBuiltins)
+            fragment.files += file
             if (containsStdlib && cacheDeserializationStrategy.containsKFunctionImpl)
                 fragment.files += files.filter { it.isFunctionInterfaceFile }