diff --git a/code/ryzom/server/src/ai_service/fx_entity.h b/code/ryzom/server/src/ai_service/fx_entity.h
index 74ea07f91..028ee3ad9 100644
--- a/code/ryzom/server/src/ai_service/fx_entity.h
+++ b/code/ryzom/server/src/ai_service/fx_entity.h
@@ -32,7 +32,7 @@ public:
 	NLMISC::CEntityId const& id() const;
 	bool spawn();
 	void despawn();
-	bool update() { }
+	bool update() { return false; }
 	void set(std::string const& prop, std::string const& value, bool reportChange=false) { }
 	std::string get(std::string const& prop);
 	std::string getIndexString() const { return _EntityId.toString(); }