diff --git a/masque/repetition.py b/masque/repetition.py
index 5e7a7f0..a774f7e 100644
--- a/masque/repetition.py
+++ b/masque/repetition.py
@@ -391,7 +391,7 @@ class Arbitrary(Repetition):
         Returns:
             self
         """
-        self.displacements[1 - axis] *= -1
+        self.displacements[:, 1 - axis] *= -1
         return self
 
     def get_bounds(self) -> NDArray[numpy.float64] | None: