diff --git a/compiler/frontend.common.jvm/src/org/jetbrains/kotlin/fileClasses/JvmFileClassUtil.kt b/compiler/frontend.common.jvm/src/org/jetbrains/kotlin/fileClasses/JvmFileClassUtil.kt
index 48ca3bebe58..ff36d595eed 100644
--- a/compiler/frontend.common.jvm/src/org/jetbrains/kotlin/fileClasses/JvmFileClassUtil.kt
+++ b/compiler/frontend.common.jvm/src/org/jetbrains/kotlin/fileClasses/JvmFileClassUtil.kt
@@ -35,7 +35,8 @@ object JvmFileClassUtil {
     fun getFacadeClassInternalName(file: KtFile): String =
         getFileClassInfoNoResolve(file).facadeClassFqName.internalNameWithoutInnerClasses
 
-    private fun manglePartName(facadeName: String, fileName: String): String =
+    @JvmStatic
+    fun manglePartName(facadeName: String, fileName: String): String =
         "$facadeName$MULTIFILE_PART_NAME_DELIMITER${PackagePartClassUtils.getFilePartShortName(fileName)}"
 
     @JvmStatic
diff --git a/compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/FileClassLowering.kt b/compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/FileClassLowering.kt
index 4f84b5a5af6..68a74ecb66b 100644
--- a/compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/FileClassLowering.kt
+++ b/compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/FileClassLowering.kt
@@ -44,7 +44,6 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.JvmNames.JVM_MULTIFILE_CLASS_SHORT
 import org.jetbrains.kotlin.name.JvmNames.JVM_NAME_SHORT
 import org.jetbrains.kotlin.name.JvmNames.JVM_PACKAGE_NAME_SHORT
-import org.jetbrains.kotlin.name.JvmNames.MULTIFILE_PART_NAME_DELIMITER
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.inline.INLINE_ONLY_ANNOTATION_FQ_NAME
@@ -177,7 +176,7 @@ fun getFileClassInfoFromIrFile(file: IrFile, fileName: String): JvmFileClassInfo
             val facadeClassFqName = packageFqName.child(Name.identifier(simpleName))
             when {
                 parsedAnnotations.isMultifileClass -> JvmMultifileClassPartInfo(
-                    fileClassFqName = packageFqName.child(Name.identifier(manglePartName(simpleName, fileName))),
+                    fileClassFqName = packageFqName.child(Name.identifier(JvmFileClassUtil.manglePartName(simpleName, fileName))),
                     facadeClassFqName = facadeClassFqName
                 )
                 else -> JvmSimpleFileClassInfo(facadeClassFqName, true)
@@ -216,7 +215,4 @@ private fun getLiteralStringFromAnnotation(annotationCall: IrConstructorCall): S
     }
 }
 
-private fun manglePartName(facadeName: String, fileName: String): String =
-    "$facadeName$MULTIFILE_PART_NAME_DELIMITER${PackagePartClassUtils.getFilePartShortName(fileName)}"
-
 internal class ParsedJvmFileClassAnnotations(val jvmName: String?, val jvmPackageName: FqName?, val isMultifileClass: Boolean)