diff --git a/Upsilon/Parser/Lexer.cs b/Upsilon/Parser/Lexer.cs
index 22b65fe..03d6050 100644
--- a/Upsilon/Parser/Lexer.cs
+++ b/Upsilon/Parser/Lexer.cs
@@ -107,7 +107,8 @@ namespace Upsilon.Parser
                 case '^':
                     return new SyntaxToken(SyntaxKind.RoofSign, _position, "^", null);
                 case '"':
-                    return LexString();
+                case '\'':
+                    return LexString(Current);
                 case '=':
                     if (Next == '=')
                     {
@@ -174,26 +175,26 @@ namespace Upsilon.Parser
             return new SyntaxToken(SyntaxKind.Number, start, numStr.ToString(), o);
         }
 
-        private SyntaxToken LexString()
+        private SyntaxToken LexString(char current)
         {
             var start = _position;
             var sb = new StringBuilder();
             while (_position < _text.Length)
             {
                 _position++;
-                if (Current == '\\' && Next == '"')
+                if (Current == '\\' && Next == current)
                 {
-                    sb.Append("\"");
+                    sb.Append(current);
                     _position += 2;
                 }
-                if (Current == '"')
+                if (Current == current)
                     break;
                 sb.Append(Current);
             }
 
-            if (Current != '"')
+            if (Current != current)
             {
-                _diagnostics.LogBadCharacter(new TextSpan(_position, 1), '"', Current);
+                _diagnostics.LogBadCharacter(new TextSpan(_position, 1), current, Current);
             }
 
             var res = sb.ToString();