diff --git a/lib/src/visitor/serialize.dart b/lib/src/visitor/serialize.dart
index 7ec5270c..9f4c481f 100644
--- a/lib/src/visitor/serialize.dart
+++ b/lib/src/visitor/serialize.dart
@@ -104,7 +104,7 @@ class _SerializeCssVisitor
     var minimumIndentation = _minimumIndentation(node.text);
     if (minimumIndentation == null) {
       _writeIndentation();
-      _buffer.writeln(node.text);
+      _buffer.write(node.text);
       return;
     }