diff --git a/mrdna/simulate.py b/mrdna/simulate.py
index 18f421780e9cff831419d5a22f49fcb300105d9c..b7c034d6418c2b93dbc01e6d318d25a359330197 100644
--- a/mrdna/simulate.py
+++ b/mrdna/simulate.py
@@ -142,7 +142,7 @@ def multiresolution_simulation( model, output_name,
             run_step(num_steps=coarse_steps, simargs=simargs)
 
         """ Fine simulation """ 
-        simargs = dict(timestep=50e-6, output_period=fine_output_period, gpu=gpu)
+        simargs = dict(timestep=40e-6, output_period=fine_output_period, gpu=gpu)
         model.clear_beads()
         model.generate_bead_model( 1, 1, local_twist=True, escapable_twist=True )
         run_step(num_steps=fine_steps, simargs=simargs, do_coordinate_average=(fine_steps > 2*fine_output_period+1))