diff --git a/2020/DayTemplate.cs b/2020/DayTemplate.cs
index c432f36..13f9463 100644
--- a/2020/DayTemplate.cs
+++ b/2020/DayTemplate.cs
@@ -3,6 +3,7 @@ using static System.Console;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Text.RegularExpressions;
 using Xunit;
 
 namespace AdventOfCode {