diff --git a/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/DelegatingFileSystemProvider.java b/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/DelegatingFileSystemProvider.java
index 4ce20fe26fb6..fbe022bdac7a 100644
--- a/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/DelegatingFileSystemProvider.java
+++ b/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/DelegatingFileSystemProvider.java
@@ -4,6 +4,7 @@ package com.intellij.platform.core.nio.fs;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.VisibleForTesting;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -38,7 +39,7 @@ public abstract class DelegatingFileSystemProvider<
   /**
    * @return A delegating file system which is bound to this provider.
    */
-  protected abstract @NotNull F wrapDelegateFileSystem(@NotNull FileSystem delegateFs);
+  public abstract @NotNull F wrapDelegateFileSystem(@NotNull FileSystem delegateFs);
 
   /**
    * @param path1 A path passed to some method of {@link FileSystemProvider}.
diff --git a/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/MultiRoutingFileSystemProvider.java b/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/MultiRoutingFileSystemProvider.java
index aa44db287487..9589db7d78c4 100644
--- a/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/MultiRoutingFileSystemProvider.java
+++ b/platform/core-nio-fs/src/com/intellij/platform/core/nio/fs/MultiRoutingFileSystemProvider.java
@@ -63,7 +63,7 @@ public final class MultiRoutingFileSystemProvider
   }
 
   @Override
-  protected @NotNull MultiRoutingFileSystem wrapDelegateFileSystem(@NotNull FileSystem delegateFs) {
+  public @NotNull MultiRoutingFileSystem wrapDelegateFileSystem(@NotNull FileSystem delegateFs) {
     return new MultiRoutingFileSystem(this, delegateFs);
   }