diff --git a/src/vertex_engine/utils/define.hpp b/src/vertex_engine/utils/define.hpp
index fb8c65f..1cc286f 100755
--- a/src/vertex_engine/utils/define.hpp
+++ b/src/vertex_engine/utils/define.hpp
@@ -4,7 +4,8 @@
   (1 << x)
 
 #define VE_EVENT_OVERIDE()\
-  void on_event(VE::event& e) override
+  public:\
+    void on_event(VE::event& e) override
 
 #define VE_OVERIDE()\
   public:\