diff --git a/introduction_to_python/recursive_functions/2_find_factorial/solutions/.model_solution/solution.py b/introduction_to_python/recursive_functions/2_find_factorial/solutions/.model_solution/solution.py
index 87772280..f25ca8b5 100644
--- a/introduction_to_python/recursive_functions/2_find_factorial/solutions/.model_solution/solution.py
+++ b/introduction_to_python/recursive_functions/2_find_factorial/solutions/.model_solution/solution.py
@@ -1,3 +1,3 @@
-def factorial_recursive(n):
-    return 1 if n is 1 else n * factorial_recursive(n-1)
+def factorial_recursive(integer: int) -> int:
+    return 1 if integer is 0 else integer * factorial_recursive(integer - 1)