diff --git a/doc/code/tutorials/part_1/1_where_to_start.py b/doc/code/tutorials/part_1/1_where_to_start.py
index 7b51cdafb..1606e3e8e 100644
--- a/doc/code/tutorials/part_1/1_where_to_start.py
+++ b/doc/code/tutorials/part_1/1_where_to_start.py
@@ -38,7 +38,7 @@ def main():
         # Select the next generation individuals
         offspring = toolbox.select(pop, len(pop))
         # Clone the selected individuals
-        offspring = map(toolbox.clone, offspring)
+        offspring = list(map(toolbox.clone, offspring))
 
         # Apply crossover and mutation on the offspring
         for child1, child2 in zip(offspring[::2], offspring[1::2]):