diff --git a/manimlib/mobject/mobject.py b/manimlib/mobject/mobject.py
index e446fe08..3fb20fbb 100644
--- a/manimlib/mobject/mobject.py
+++ b/manimlib/mobject/mobject.py
@@ -1109,7 +1109,7 @@ class Mobject(object):
     def match_z(self, mobject, direction=ORIGIN):
         return self.match_coord(mobject, 2, direction)
 
-    def align_to(self, mobject_or_point, direction=ORIGIN, alignment_vect=UP):
+    def align_to(self, mobject_or_point, direction=ORIGIN):
         """
         Examples:
         mob1.align_to(mob2, UP) moves mob1 vertically so that its