diff --git a/source/simple/interactive/event.h b/source/simple/interactive/event.h
index 198e7998c2dd04e2485a0ab7ce0a450e35f1cfc0..5dc79f2a0e33b989f7ad9bc78dd17800f622581f 100644
--- a/source/simple/interactive/event.h
+++ b/source/simple/interactive/event.h
@@ -36,6 +36,7 @@ namespace simple::interactive
 
 	enum class mouse_button_mask : uint32_t
 	{
+		none = 0,
 		left = SDL_BUTTON_LMASK,
 		right = SDL_BUTTON_RMASK,
 		middle = SDL_BUTTON_MMASK,