1 files changed, 1 insertions, 1 deletions
diff --git a/Day5.cs b/Day5.cs
index f08eec1..fc360aa 100644
--- a/Day5.cs
+++ b/Day5.cs
@@ -3,7 +3,7 @@ using System.Linq;
 
 namespace aoc2019
 {
-    internal class Day5 : Day
+    internal sealed class Day5 : Day
     {
         public override int DayNumber => 5;