diff --git a/test/fixtures/helper.js b/test/fixtures/helper.js
index 13703e4..9143bad 100644
--- a/test/fixtures/helper.js
+++ b/test/fixtures/helper.js
@@ -23,7 +23,7 @@ function eltLoaded(id, lazyAttr) {
   return function(done) {
     var elt = document.getElementById(id);
     setTimeout(function() {
-      assert(elt.getAttribute('data-lzled') === true);
+      assert(elt.getAttribute('data-lzled') === 'true');
       done();
     }, 40);
   };