diff --git a/lib/src/parser.dart b/lib/src/parser.dart
index be290451..84095451 100644
--- a/lib/src/parser.dart
+++ b/lib/src/parser.dart
@@ -280,6 +280,7 @@ class Parser {
     var couldBeSelector =
         postColonWhitespace.isEmpty && _lookingAtInterpolatedIdentifier();
 
+    var beforeDeclaration = _scanner.state;
     Expression value;
     try {
       value = _declarationExpression();
@@ -298,6 +299,7 @@ class Parser {
 
       // If the value would be followed by a semicolon, it's definitely supposed
       // to be a property, not a selector.
+      _scanner.state = beforeDeclaration;
       var additional = _almostAnyValue();
       if (_scanner.peekChar() == $semicolon) rethrow;
 
diff --git a/lib/src/visitor/serialize.dart b/lib/src/visitor/serialize.dart
index 6a7edbde..0f1821af 100644
--- a/lib/src/visitor/serialize.dart
+++ b/lib/src/visitor/serialize.dart
@@ -319,8 +319,8 @@ class _SerializeCssVisitor extends CssVisitor {
       throw new UnsupportedError("$parent cannot be converted to CSS.");
 
   void visitPseudoSelector(PseudoSelector pseudo) {
-    _buffer.write($colon);
-    if (pseudo.type == PseudoType.element) _buffer.write($colon);
+    _buffer.writeCharCode($colon);
+    if (pseudo.type == PseudoType.element) _buffer.writeCharCode($colon);
     _buffer.write(pseudo.name);
     if (pseudo.argument == null && pseudo.selector == null) return;