diff --git a/FiCurve.py b/FiCurve.py
index 5d95a58..d32e1a7 100644
--- a/FiCurve.py
+++ b/FiCurve.py
@@ -140,9 +140,8 @@ class FICurve:
         infty_vars = self.f_infinity_fit
         return fu.clipped_line(stimulus_value, infty_vars[0], infty_vars[1])
 
-
     def get_f_infinity_slope(self):
-        return self.f_infinity_fit[1]
+        return self.f_infinity_fit[0]
 
     def get_fi_curve_slope_at(self, stimulus_value):
         fit_vars = self.boltzmann_fit_vars