diff --git a/manimlib/mobject/mobject.py b/manimlib/mobject/mobject.py
index 911bc73f..43832cc5 100644
--- a/manimlib/mobject/mobject.py
+++ b/manimlib/mobject/mobject.py
@@ -83,7 +83,7 @@ class Mobject(object):
         # If true, the mobject will not get rotated according to camera position
         is_fixed_in_frame: bool = False,
         depth_test: bool = False,
-        zorder: int = 0,
+        z_index: int = 0,
     ):
         self.color = color
         self.opacity = opacity