diff --git a/carculator_truck/inventory.py b/carculator_truck/inventory.py
index 5aeeb1c..51a2a1f 100644
--- a/carculator_truck/inventory.py
+++ b/carculator_truck/inventory.py
@@ -1573,7 +1573,7 @@ def get_B_matrix(self):
                 )
             )
 
-            new_B[0: np.shape(initial_B)[0], 0: np.shape(initial_B)[1]] = initial_B
+            new_B[0 : np.shape(initial_B)[0], 0 : np.shape(initial_B)[1]] = initial_B
 
             B[f] = new_B