diff --git a/MinecraftClient/CSharpRunner.cs b/MinecraftClient/CSharpRunner.cs
index 29a980cb..340bddc8 100644
--- a/MinecraftClient/CSharpRunner.cs
+++ b/MinecraftClient/CSharpRunner.cs
@@ -69,6 +69,7 @@ namespace MinecraftClient
                     {
                         "using System;",
                         "using System.Collections.Generic;",
+                        "using System.Text.RegularExpressions;",
                         "using System.Linq;",
                         "using System.Text;",
                         "using System.IO;",