diff --git a/fit_lifacnoise.py b/fit_lifacnoise.py
index 661f10b..21e4e19 100644
--- a/fit_lifacnoise.py
+++ b/fit_lifacnoise.py
@@ -66,7 +66,7 @@ class Fitter:
         if step_size is not None:
             self.model = LifacNoiseModel({"step_size": step_size})
         else:
-            self.model = LifacNoiseModel({"step_size": 0.0005})
+            self.model = LifacNoiseModel({"step_size": 0.00005})
         # self.data = data
         self.fi_contrasts = []
         self.eod_freq = 0