diff --git a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
index 207ac5f5..66b60886 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
@@ -153,22 +153,22 @@ public class FileManagerImpl implements FileManager {
 
     @Override
     public FileManager setRootDir(Path rootDir) {
-        this.rootDir = rootDir;
-        return this;
+        return this.newInstance(rootDir, this.path, this.autoCreateParent, this.disableRootDirCheck);
     }
 
     @Override
     public FileManager setPath(Path path) {
+        Path resolvedPath;
         if (this.disableRootDirCheck) {
-            this.path = path;
+            resolvedPath = path;
         } else {
             if (path.startsWith(this.rootDir)) {
-                this.path = path;
+                resolvedPath = path;
             } else {
                 throw new IllegalArgumentException("path must be in rootDir");
             }
         }
-        return this;
+        return this.newInstance(this.rootDir, resolvedPath, this.autoCreateParent, this.disableRootDirCheck);
     }
 
     @Override