diff --git a/auto_differentiation.py b/auto_differentiation.py
index 2d28603..20ea613 100644
--- a/auto_differentiation.py
+++ b/auto_differentiation.py
@@ -193,7 +193,7 @@ def evaluate_d_delta_l_i_sigma_i(val_delta_l_li, val_sigma_i):
 
     val_list = []
     for i in range(span_count):
-          val = sympy.Float(
+        val = sympy.Float(
             fx_d_delta_l_i_sigma_i(
                 val_delta_l_li[i],
                 l_array[i],