diff --git a/hsm/limbo_hsm.h b/hsm/limbo_hsm.h
index f51eafa..d0f7585 100644
--- a/hsm/limbo_hsm.h
+++ b/hsm/limbo_hsm.h
@@ -16,6 +16,7 @@
 
 #include "core/object/object.h"
 #include "core/templates/hash_map.h"
+#include "core/variant/variant.h"
 
 class LimboHSM : public LimboState {
 	GDCLASS(LimboHSM, LimboState);
@@ -64,7 +65,7 @@ public:
 	LimboState *get_initial_state() const { return initial_state; }
 
 	virtual void initialize(Node *p_agent, const Ref<Blackboard> &p_parent_scope = nullptr);
-	virtual bool dispatch(const String &p_event, const Variant &p_cargo) override;
+	virtual bool dispatch(const String &p_event, const Variant &p_cargo = Variant()) override;
 
 	void update(double p_delta) { _update(p_delta); }
 	void add_transition(Node *p_from_state, Node *p_to_state, const String &p_event);
diff --git a/hsm/limbo_state.h b/hsm/limbo_state.h
index 1e12201..841bb7f 100644
--- a/hsm/limbo_state.h
+++ b/hsm/limbo_state.h
@@ -69,7 +69,7 @@ public:
 	Node *get_agent() const { return agent; }
 	void set_agent(Node *p_agent) { agent = p_agent; }
 
-	virtual bool dispatch(const String &p_event, const Variant &p_cargo);
+	virtual bool dispatch(const String &p_event, const Variant &p_cargo = Variant());
 
 	LimboState *named(String p_name);
 	LimboState *call_on_enter(const Callable &p_callable);