diff --git a/platform/lang-impl/src/com/intellij/openapi/roots/impl/PushedFilePropertiesUpdaterImpl.java b/platform/lang-impl/src/com/intellij/openapi/roots/impl/PushedFilePropertiesUpdaterImpl.java
index b588ab6b61f9..e8ea9f4693fb 100644
--- a/platform/lang-impl/src/com/intellij/openapi/roots/impl/PushedFilePropertiesUpdaterImpl.java
+++ b/platform/lang-impl/src/com/intellij/openapi/roots/impl/PushedFilePropertiesUpdaterImpl.java
@@ -149,7 +149,7 @@ public final class PushedFilePropertiesUpdaterImpl extends PushedFilePropertiesU
   @Override
   public void initializeProperties() {
     FilePropertyPusher.EP_NAME.forEachExtensionSafe(pusher -> {
-      pusher.initExtra(myProject, myProject.getMessageBus());
+      pusher.initExtra(myProject);
     });
   }
 
diff --git a/platform/projectModel-api/src/com/intellij/openapi/roots/impl/FilePropertyPusher.java b/platform/projectModel-api/src/com/intellij/openapi/roots/impl/FilePropertyPusher.java
index 3434360d8b42..96f96f1e48b6 100644
--- a/platform/projectModel-api/src/com/intellij/openapi/roots/impl/FilePropertyPusher.java
+++ b/platform/projectModel-api/src/com/intellij/openapi/roots/impl/FilePropertyPusher.java
@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2015 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 
 package com.intellij.openapi.roots.impl;
 
@@ -67,7 +53,9 @@ import java.io.IOException;
 public interface FilePropertyPusher<T> {
   ExtensionPointName<FilePropertyPusher<?>> EP_NAME = ExtensionPointName.create("com.intellij.filePropertyPusher");
 
-  default void initExtra(@NotNull Project project, @NotNull MessageBus bus) { }
+  default void initExtra(@NotNull Project project) {
+    initExtra(project, project.getMessageBus());
+  }
 
   default void afterRootsChanged(@NotNull Project project) {}
 
@@ -105,8 +93,7 @@ public interface FilePropertyPusher<T> {
   //<editor-fold desc="Deprecated APIs" defaultState="collapsed">
 
   /**
-   * @deprecated
-   * use {@link FilePropertyPusher#initExtra(Project, MessageBus)} instead
+   * @deprecated use {@link FilePropertyPusher#initExtra(Project)} instead
    */
   @ApiStatus.ScheduledForRemoval(inVersion = "2021.3")
   @Deprecated
@@ -135,5 +122,15 @@ public interface FilePropertyPusher<T> {
     return false;
   }
 
+
+  /**
+   * @deprecated use {@link #initExtra(Project)}
+   */
+  @Deprecated
+  @SuppressWarnings({"unused", "DeprecatedIsStillUsed"})
+  default void initExtra(@NotNull Project project, @NotNull MessageBus bus) {
+    DeprecatedMethodException.report("Please override FilePropertyPusher#initExtra(Project)");
+  }
+
   //</editor-fold>
 }
diff --git a/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PythonLanguageLevelPusher.java b/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PythonLanguageLevelPusher.java
index 38a6e255126a..f11f5c018859 100644
--- a/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PythonLanguageLevelPusher.java
+++ b/python/python-psi-impl/src/com/jetbrains/python/psi/impl/PythonLanguageLevelPusher.java
@@ -76,7 +76,7 @@ public class PythonLanguageLevelPusher implements FilePropertyPusher<LanguageLev
   }
 
   @Override
-  public void initExtra(@NotNull Project project, @NotNull MessageBus bus) {
+  public void initExtra(@NotNull Project project) {
     final Map<Module, Sdk> moduleSdks = getPythonModuleSdks(project);
     final Set<Sdk> distinctSdks = StreamEx.ofValues(moduleSdks).nonNull().collect(Collectors.toCollection(LinkedHashSet::new));