diff --git a/svg.filter.js b/svg.filter.js
index 25f4fa6..55b2a83 100644
--- a/svg.filter.js
+++ b/svg.filter.js
@@ -112,7 +112,7 @@
     }
     // Default string value
   , toString: function() {
-      return 'url(#' + this.attr('id') + ')'
+      return 'url(' + window.location.href + '#' + this.attr('id') + ')'
     }
 
   })