diff --git a/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryImpl.kt b/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryImpl.kt
index da9b902af33..52723694bf9 100644
--- a/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryImpl.kt
+++ b/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryImpl.kt
@@ -229,8 +229,8 @@ fun createKotlinLibrary(
 
     val base = BaseKotlinLibraryImpl(baseAccess, isDefault)
     val metadata = MetadataLibraryImpl(metadataAccess)
-//    val ir = IrMonoliticLibraryImpl(irAccess)
-    val ir = IrPerFileLibraryImpl(irAccess)
+    val ir = IrMonoliticLibraryImpl(irAccess)
+//    val ir = IrPerFileLibraryImpl(irAccess)
 
     return KotlinLibraryImpl(base, metadata, ir)
 }
\ No newline at end of file
diff --git a/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryWriterImpl.kt b/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryWriterImpl.kt
index c070d645db6..178ea8ca8aa 100644
--- a/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryWriterImpl.kt
+++ b/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryWriterImpl.kt
@@ -81,8 +81,8 @@ class KoltinLibraryWriterImpl(
 
     base: BaseWriter = BaseWriterImpl(layout, moduleName, versions, nopack),
     metadata: MetadataWriter = MetadataWriterImpl(layout),
-//    ir: IrWriter = IrMonoliticWriterImpl(layout)
-    ir: IrWriter = IrPerFileWriterImpl(layout)
+    ir: IrWriter = IrMonoliticWriterImpl(layout)
+//    ir: IrWriter = IrPerFileWriterImpl(layout)
 
 ) : BaseWriter by base, MetadataWriter by metadata, IrWriter by ir, KotlinLibraryWriter