diff --git a/src/tink/csss/Parser.hx b/src/tink/csss/Parser.hx
index 1823a14..ce718b7 100644
--- a/src/tink/csss/Parser.hx
+++ b/src/tink/csss/Parser.hx
@@ -105,7 +105,7 @@ class Parser<Position, Error> extends tink.parse.ParserBase<Position, Error> {
   }
 
   function parseSelectorNext(tag:String) {
-    var ret = { tag: tag, id: null, classes: [], attrs: new Array<AttrFilter>(), pseudos: [] };
+    var ret = { tag: tag, id: (null:String), classes: [], attrs: new Array<AttrFilter>(), pseudos: [] };
     while (true) {
       if (allowHere('#')) {
         if (ret.id != null) die('cannot have multiple ids (already have ${ret.id})');
@@ -300,4 +300,4 @@ class Parser<Position, Error> extends tink.parse.ParserBase<Position, Error> {
     // 'first' => First, // some @page at-rule related stuff
     // 'left' => Left,
   ];
-}
\ No newline at end of file
+}