diff --git a/project_euler/problem_03/sol3.py b/project_euler/problem_03/sol3.py
index 9893c704ea5f..34329c26e621 100644
--- a/project_euler/problem_03/sol3.py
+++ b/project_euler/problem_03/sol3.py
@@ -7,7 +7,7 @@
 """
 
 
-def solution(n):
+def solution(n:int)->int:
     """Returns the largest prime factor of a given number n.
 
     >>> solution(13195)
@@ -41,7 +41,6 @@ def solution(n):
         raise TypeError("Parameter n must be int or passive of cast to int.")
     if n <= 0:
         raise ValueError("Parameter n must be greater or equal to one.")
-    prime = 1
     i = 2
     ans = 0
     if n==2: