diff --git a/compiler/ir/serialization.common/src/KotlinIr.proto b/compiler/ir/serialization.common/src/KotlinIr.proto
index 73bf09a3fd5..d5fcca1db38 100644
--- a/compiler/ir/serialization.common/src/KotlinIr.proto
+++ b/compiler/ir/serialization.common/src/KotlinIr.proto
@@ -1,6 +1,7 @@
 syntax = "proto2";
-package org.jetbrains.kotlin.backend.common.serialization;
+package org.jetbrains.kotlin.backend.common.serialization.proto;
 
+option java_multiple_files = true;
 option java_outer_classname = "KotlinIr";
 option optimize_for = LITE_RUNTIME;