diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
index 120bfa0af..55aa7780c 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
@@ -256,6 +256,7 @@ public final class Tools {
         gameDir.mkdirs();
 
         Map<String, String> varArgMap = new ArrayMap<>();
+        varArgMap.put("auth_session", profile.accessToken); // For legacy versions of MC
         varArgMap.put("auth_access_token", profile.accessToken);
         varArgMap.put("auth_player_name", username);
         varArgMap.put("auth_uuid", profile.profileId);