diff --git a/Launcher/source/Launcher.java b/Launcher/source/Launcher.java
index 1fac671..22574ab 100644
--- a/Launcher/source/Launcher.java
+++ b/Launcher/source/Launcher.java
@@ -77,20 +77,14 @@
     private static final AtomicReference<Config> CONFIG = new AtomicReference<>();
 
     // Version info
-    @LauncherAPI
-    public static final String VERSION = "15.4";
-    @LauncherAPI
-    public static final String BUILD = readBuildNumber();
-    @LauncherAPI
-    public static final int PROTOCOL_MAGIC = 0x724724_00 + 23;
+    @LauncherAPI public static final String VERSION = "15.4";
+    @LauncherAPI public static final String BUILD = readBuildNumber();
+    @LauncherAPI public static final int PROTOCOL_MAGIC = 0x724724_00 + 23;
 
     // Constants
-    @LauncherAPI
-    public static final String RUNTIME_DIR = "runtime";
-    @LauncherAPI
-    public static final String CONFIG_FILE = "config.bin";
-    @LauncherAPI
-    public static final String INIT_SCRIPT_FILE = "init.js";
+    @LauncherAPI public static final String RUNTIME_DIR = "runtime";
+    @LauncherAPI public static final String CONFIG_FILE = "config.bin";
+    @LauncherAPI public static final String INIT_SCRIPT_FILE = "init.js";
 
     // Instance
     private final AtomicBoolean started = new AtomicBoolean(false);
diff --git a/Launcher/source/helper/CommonHelper.java b/Launcher/source/helper/CommonHelper.java
index 8a7d426..e41e766 100644
--- a/Launcher/source/helper/CommonHelper.java
+++ b/Launcher/source/helper/CommonHelper.java
@@ -7,7 +7,7 @@
 import launcher.LauncherAPI;
 
 public final class CommonHelper {
-    private static final String[] SCRIPT_ENGINE_ARGS = { "-strict" };
+    private static final String[] SCRIPT_ENGINE_ARGS = { "-strict", "--language=es6", "--optimistic-types=false" };
 
     private CommonHelper() {
     }