diff --git a/scadnano/scadnano.py b/scadnano/scadnano.py
index 2cc827b1..7f4ffc74 100644
--- a/scadnano/scadnano.py
+++ b/scadnano/scadnano.py
@@ -6646,6 +6646,7 @@ def _oxdna_get_helix_vectors(design: Design, helix: Helix) -> Tuple[_OxdnaVector
     forward = forward.rotate(design.yaw_of_helix(helix), normal)
     forward = forward.rotate(-design.pitch_of_helix(helix), _OxdnaVector(1, 0, 0))
     normal = normal.rotate(-design.pitch_of_helix(helix), _OxdnaVector(1, 0, 0))
+    
     normal = normal.rotate(-helix.roll, forward)
 
     x: float = 0.0