diff --git a/Eto.Parse/Parsers/LiteralTerminal.cs b/Eto.Parse/Parsers/LiteralTerminal.cs
index f56b4d3..8d3cce6 100644
--- a/Eto.Parse/Parsers/LiteralTerminal.cs
+++ b/Eto.Parse/Parsers/LiteralTerminal.cs
@@ -27,6 +27,7 @@ public LiteralTerminal()
 
 		public LiteralTerminal(string value)
 		{
+			value.ThrowIfNull("value", "Value must not be null");
 			Value = value;
 		}
 
@@ -38,11 +39,7 @@ public override void Initialize(ParserInitializeArgs args)
 
 		protected override int InnerParse(ParseArgs args)
 		{
-			if (Value != null)
-			{
-				return !args.Scanner.ReadString(Value, caseSensitive) ? -1 : Value.Length;
-			}
-			return 0;
+			return !args.Scanner.ReadString(Value, caseSensitive) ? -1 : Value.Length;
 		}
 
 		public override Parser Clone(ParserCloneArgs args)
diff --git a/Eto.Parse/Parsers/RepeatCharTerminal.cs b/Eto.Parse/Parsers/RepeatCharTerminal.cs
index dd43f02..944f1fc 100644
--- a/Eto.Parse/Parsers/RepeatCharTerminal.cs
+++ b/Eto.Parse/Parsers/RepeatCharTerminal.cs
@@ -83,7 +83,6 @@ protected override int InnerParse(ParseArgs args)
 				var count = 0;
 				while (ch != -1 && item.Test((char)ch))
 				{
-					length++;
 					count++;
 					ch = scanner.ReadChar();
 					if (count >= item.Maximum)
@@ -94,6 +93,7 @@ protected override int InnerParse(ParseArgs args)
 					scanner.Position = pos;
 					return -1;
 				}
+				length += count;
 			}
 			scanner.Position = pos + length;
 			return length;
diff --git a/Eto.Parse/Parsers/SequenceParser.cs b/Eto.Parse/Parsers/SequenceParser.cs
index 7f825f6..67b08e5 100644
--- a/Eto.Parse/Parsers/SequenceParser.cs
+++ b/Eto.Parse/Parsers/SequenceParser.cs
@@ -56,9 +56,7 @@ protected override int InnerParse(ParseArgs args)
 						childMatch = parser.Parse(args);
 						if (childMatch >= 0)
 						{
-							if (childMatch > 0)
-								length += sepMatch;
-							length += childMatch;
+							length += childMatch + sepMatch;
 							continue;
 						}
 					}