diff --git a/maths/fibonacci.py b/maths/fibonacci.py
index 71ff479f9cc2..e4873d8488b2 100644
--- a/maths/fibonacci.py
+++ b/maths/fibonacci.py
@@ -53,8 +53,9 @@ def fib_iterative_yield(n: int) -> Iterator[int]:
         ...
     ValueError: n is negative
     """
-    if n < 0:
-        raise ValueError("n is negative")
+def fib_iterative(n: int) -> list[int]:
+    _validate_int_non_negative("n", n)
+
     a, b = 0, 1
     yield a
     for _ in range(n):