diff --git a/server/controllers/FileSystemController.js b/server/controllers/FileSystemController.js
index edfd869c3..7629f9ee2 100644
--- a/server/controllers/FileSystemController.js
+++ b/server/controllers/FileSystemController.js
@@ -89,6 +89,7 @@ class FileSystemController {
     }
 
     const { directory, folderPath } = req.body
+
     if (!directory?.length || typeof directory !== 'string' || !folderPath?.length || typeof folderPath !== 'string') {
       Logger.error(`[FileSystemController] Invalid request body: ${JSON.stringify(req.body)}`)
       return res.status(400).json({
@@ -108,8 +109,7 @@ class FileSystemController {
       return res.sendStatus(404)
     }
 
-    const filepath = Path.join(libraryFolder.path, directory)
-
+    const filepath = Path.posix.join(libraryFolder.path, directory)
     // Ensure filepath is inside library folder (prevents directory traversal)
     if (!filepath.startsWith(libraryFolder.path)) {
       Logger.error(`[FileSystemController] Filepath is not inside library folder: ${filepath}`)