diff --git a/Launcher/source/client/ClientLauncher.java b/Launcher/source/client/ClientLauncher.java
index 13fa915..082c52e 100644
--- a/Launcher/source/client/ClientLauncher.java
+++ b/Launcher/source/client/ClientLauncher.java
@@ -285,6 +285,10 @@
             Collections.addAll(args, "--versionType", "KJ-Launcher v" + Launcher.VERSION);
         }
 
+        // Fix `-XstartOnFirstThread` in MacOS
+        if (version.compareTo(Version.MC1132) >= 0 && JVMHelper.OS_TYPE == OS.MACOSX)
+            Collections.addAll(args, "-XstartOnFirstThread");
+
         // Add server args
         if (params.autoEnter)
         {
@@ -475,4 +479,4 @@
     }
 }
 
-// Н@хуя это здесь? *facepam*
\ No newline at end of file
+// Н@хуя это здесь? *facepam*