diff --git a/ProjectEulerCS/Problems/Problem13.cs b/ProjectEulerCS/Problems/Problem13.cs
index f906b60..afa808d 100644
--- a/ProjectEulerCS/Problems/Problem13.cs
+++ b/ProjectEulerCS/Problems/Problem13.cs
@@ -165,8 +165,8 @@ namespace ProjectEulerCS.Problems{
 		//Constructor
 		public Problem13() : base("Work out the first ten digits of the sum of the one-hundred 50-digit numbers"){
 			nums = new List<BigInteger>(100);
-			ReserveVectors();
 			sum = 0;
+			ReserveVectors();
 		}
 		//Reserve the size of the vector to speed up insertion
 		private void ReserveVectors(){