diff --git a/pygem/bin/run/run_calibration.py b/pygem/bin/run/run_calibration.py
index 101c9812..49f36dc6 100755
--- a/pygem/bin/run/run_calibration.py
+++ b/pygem/bin/run/run_calibration.py
@@ -913,8 +913,9 @@ def run(list_packed_vars):
                     # set calving_k in config
                     cfg.PARAMS['use_kcalving_for_run'] = True
                     cfg.PARAMS['calving_k'] = calving_k
-                    # some tidewater glaciers require a timestep << OGGM default of 60 seconds
-                    cfg.PARAMS['cfl_min_dt'] = pygem_prms['sim']['oggm_dynamics']['fs']
+                # note, some tidewater glaciers require a timestep << OGGM default of 60 seconds
+                cfg.PARAMS['cfl_number'] = pygem_prms['sim']['oggm_dynamics']['cfl_number']
+                cfg.PARAMS['cfl_min_dt'] = pygem_prms['sim']['oggm_dynamics']['cfl_min_dt']
 
             # if `args.spinup`, grab appropriate model flowlines
             if args.spinup: