diff --git a/manimlib/mobject/geometry.py b/manimlib/mobject/geometry.py
index f61b82b2..b5efefcd 100644
--- a/manimlib/mobject/geometry.py
+++ b/manimlib/mobject/geometry.py
@@ -970,8 +970,13 @@ class Polygon(VMobject):
 
 
 class Polyline(VMobject):
-    def __init__(self, *vertices: Vect3, **kwargs):
-        super().__init__(**kwargs)
+    def __init__(
+        self,
+        *vertices: Vect3,
+        flat_stroke: bool = True,
+        **kwargs
+    ):
+        super().__init__(flat_stroke=flat_stroke, **kwargs)
         self.set_points_as_corners(vertices)