diff --git a/Geekbot.net/Lib/DiceParser/SingleDie.cs b/Geekbot.net/Lib/DiceParser/SingleDie.cs
index 24280d1..582fe29 100644
--- a/Geekbot.net/Lib/DiceParser/SingleDie.cs
+++ b/Geekbot.net/Lib/DiceParser/SingleDie.cs
@@ -32,7 +32,7 @@ namespace Geekbot.net.Lib.DiceParser
             {
                 var result = new DieResult
                 {
-                    Roll1 = _random.Next(1, Sides),
+                    Roll1 = _random.Next(1, Sides + 1),
                     AdvantageType = AdvantageType
                 };