diff --git a/masque/shapes/arc.py b/masque/shapes/arc.py
index 0416d01..b12113c 100644
--- a/masque/shapes/arc.py
+++ b/masque/shapes/arc.py
@@ -326,6 +326,7 @@ class Arc(Shape, metaclass=AutoSlots):
     def mirror(self, axis: int) -> 'Arc':
         self.offset[axis - 1] *= -1
         self.rotation *= -1
+        self.rotation += axis * pi
         self.angles *= -1
         return self
 
diff --git a/masque/shapes/ellipse.py b/masque/shapes/ellipse.py
index 140f590..f9aefbf 100644
--- a/masque/shapes/ellipse.py
+++ b/masque/shapes/ellipse.py
@@ -183,6 +183,7 @@ class Ellipse(Shape, metaclass=AutoSlots):
     def mirror(self, axis: int) -> 'Ellipse':
         self.offset[axis - 1] *= -1
         self.rotation *= -1
+        self.rotation += axis * pi
         return self
 
     def scale_by(self, c: float) -> 'Ellipse':