diff --git a/src/Platform/Sdl2Application.h b/src/Platform/Sdl2Application.h
index e0a90fcac..8b1c58177 100644
--- a/src/Platform/Sdl2Application.h
+++ b/src/Platform/Sdl2Application.h
@@ -522,8 +522,8 @@ class Sdl2Application::MouseEvent: public Sdl2Application::InputEvent {
             Left = SDL_BUTTON_LEFT,         /**< Left button */
             Middle = SDL_BUTTON_MIDDLE,     /**< Middle button */
             Right = SDL_BUTTON_RIGHT,       /**< Right button */
-            WheelUp = 4,                    /**< Wheel up */
-            WheelDown = 5                   /**< Wheel down */
+            WheelUp = SDL_BUTTON_X1,        /**< Wheel up */
+            WheelDown = SDL_BUTTON_X2       /**< Wheel down */
         };
 
         /** @brief Button */