diff --git a/femmt/functions_reluctance.py b/femmt/functions_reluctance.py
index 76d017b7..811f1641 100644
--- a/femmt/functions_reluctance.py
+++ b/femmt/functions_reluctance.py
@@ -1111,7 +1111,8 @@ def resistance_litz_wire(core_inner_diameter: float, window_w: float, window_h:
         # figure out the windings per column
         windings_per_column = possible_number_turns_per_column * np.ones(int(number_of_columns))
         last_column_turns = np.mod(turns_count, possible_number_turns_per_column)
-        windings_per_column[-1] = last_column_turns
+        if last_column_turns != 0:
+            windings_per_column[-1] = last_column_turns
 
         # get the total turn length
         total_turn_length = np.sum(np.multiply(windings_per_column, turn_length_per_column))
@@ -1130,7 +1131,8 @@ def resistance_litz_wire(core_inner_diameter: float, window_w: float, window_h:
         number_of_rows = np.ceil(turns_count / possible_number_turns_per_row)
         windings_per_row = possible_number_turns_per_row * np.ones(int(number_of_rows))
         last_row_turns = np.mod(turns_count, possible_number_turns_per_row)
-        windings_per_row[-1] = last_row_turns
+        if last_row_turns != 0:
+            windings_per_row[-1] = last_row_turns
 
         # get the total turn length
         total_turn_length = 0