diff --git a/terrainrenderer.go b/terrainrenderer.go
index cfd3837..ed97417 100644
--- a/terrainrenderer.go
+++ b/terrainrenderer.go
@@ -34,7 +34,7 @@ func (r *terrainRenderer) Init(ctx *Context) error {
 
 func isControlKeyDown() bool {
 	state := sdl.GetKeyboardState()
-	return state[sdl.SCANCODE_LCTRL] == 1 || state[sdl.SCANCODE_RCTRL] == 1
+	return state[sdl.SCANCODE_LCTRL] == 1 || state[sdl.SCANCODE_RCTRL] == 1 || state[sdl.SCANCODE_LGUI] == 1 || state[sdl.SCANCODE_RGUI] == 1
 }
 
 func (r *terrainRenderer) Handle(ctx *Context, event sdl.Event) bool {