diff --git a/Difficult_Rocket/gui/widget/button.py b/Difficult_Rocket/gui/widget/button.py
index fae6dba3..9abf1897 100644
--- a/Difficult_Rocket/gui/widget/button.py
+++ b/Difficult_Rocket/gui/widget/button.py
@@ -540,6 +540,7 @@ def __init__(
     ) -> None:
         self._x = x
         self._y = y
+        self._z = 1.0
         self._width = width
         self._height = height
         self._thick1 = thick1