diff --git a/Upsilon/Parser/Parser.cs b/Upsilon/Parser/Parser.cs
index c5d3e48..d0a4282 100644
--- a/Upsilon/Parser/Parser.cs
+++ b/Upsilon/Parser/Parser.cs
@@ -429,7 +429,7 @@ namespace Upsilon.Parser
             var openParenthesis = MatchToken(SyntaxKind.OpenParenthesis);
             var parameters = ImmutableArray.CreateBuilder<ExpressionSyntax>();
             SyntaxToken current = null;
-            while (Current.Kind != SyntaxKind.CloseParenthesis)
+            while (Current.Kind != SyntaxKind.CloseParenthesis && Current.Kind != SyntaxKind.EndOfFile)
             {
                 if (Current == current)
                 {