diff --git a/Examples/Python/sim03_Structures/Interference1DLattice.py b/Examples/Python/sim03_Structures/Interference1DLattice.py
index a9917e0b48d1333c630a4b8176b1662936bca1e7..5e9301b2688fa4c52d7db33ac39ea489a82180c0 100644
--- a/Examples/Python/sim03_Structures/Interference1DLattice.py
+++ b/Examples/Python/sim03_Structures/Interference1DLattice.py
@@ -30,7 +30,7 @@ def get_sample():
 
     particle_layout = ba.ParticleLayout()
     particle_layout.addParticle(box, 1.0, ba.kvector_t(0.0, 0.0, 0.0),
-                                ba.RotationZ(lattice_rotation_angle))
+                                ba.RotationZ(45*deg))
     particle_layout.setInterferenceFunction(interference)
 
     # assembling the sample