diff --git a/LaunchServer/src/main/java/pro/gravit/launchserver/websocket/fileserver/FileServerHandler.java b/LaunchServer/src/main/java/pro/gravit/launchserver/websocket/fileserver/FileServerHandler.java
index 3a3af245..290b745d 100644
--- a/LaunchServer/src/main/java/pro/gravit/launchserver/websocket/fileserver/FileServerHandler.java
+++ b/LaunchServer/src/main/java/pro/gravit/launchserver/websocket/fileserver/FileServerHandler.java
@@ -17,6 +17,7 @@
 import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
 import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;
@@ -189,15 +190,7 @@ private static String sanitizeUri(String uri) {
         // Convert file separators.
         uri = uri.replace(File.separatorChar, '/');
 
-        // Simplistic dumb security check.
-        // You will have to do something serious in the production environment.
-        if (uri.contains(File.separator + '.') ||
-                uri.contains('.' + File.separator) ||
-                uri.charAt(0) == '.' || uri.charAt(uri.length() - 1) == '.' ||
-                INSECURE_URI.matcher(uri).matches()) {
-            return null;
-        }
-        return uri.substring(1);
+        return Paths.get(uri).normalize().toString().substring(1);
     }
 
     private static final Pattern ALLOWED_FILE_NAME = Pattern.compile("[^-\\._]?[^<>&\\\"]*");