diff --git a/packages/daedalus/src/minecraft.rs b/packages/daedalus/src/minecraft.rs
index 45488426c9..f31e08b171 100644
--- a/packages/daedalus/src/minecraft.rs
+++ b/packages/daedalus/src/minecraft.rs
@@ -454,6 +454,7 @@ pub enum Argument {
     /// An argument which is only applied if certain conditions are met
     Ruled {
         /// The rules deciding whether the argument(s) is used or not
+        #[serde(default)]
         rules: Vec<Rule>,
         /// The container of the argument(s) that should be applied accordingly
         value: ArgumentValue,
@@ -461,13 +462,15 @@ pub enum Argument {
 }
 
 #[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Hash, Clone, Copy)]
-#[serde(rename_all = "snake_case")]
+#[serde(rename_all = "kebab-case")]
 /// The type of argument
 pub enum ArgumentType {
     /// The argument is passed to the game
     Game,
     /// The argument is passed to the JVM
     Jvm,
+    /// Passed to JVM as well. Includes default arguments to the GC.
+    DefaultUserJvm,
 }
 
 #[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Hash)]