diff --git a/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java b/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java
index 084fbc849..af9b41533 100644
--- a/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java
+++ b/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java
@@ -97,6 +97,18 @@ public final class StandardLauncher extends AbstractLauncher {
             gameArgs.add(worldName);
         }
 
+        StringBuilder joinedGameArgs = new StringBuilder();
+        for (String gameArg : gameArgs) {
+            if (joinedGameArgs.length() > 0) {
+                joinedGameArgs.append(" ");
+            }
+            joinedGameArgs.append(gameArg);
+        }
+
+        // pass the real main class and game arguments in so mods can access them
+        System.setProperty("org.prismlauncher.launch.mainclass", mainClassName);
+        System.setProperty("org.prismlauncher.launch.gameargs", joinedGameArgs.toString());
+
         // find and invoke the main method
         MethodHandle method = ReflectionUtils.findMainMethod(mainClassName);
         method.invokeExact(gameArgs.toArray(new String[0]));