diff --git a/lib/marked.js b/lib/marked.js
index 6f0e87c4c5..3eb1f9dfca 100644
--- a/lib/marked.js
+++ b/lib/marked.js
@@ -1144,8 +1144,8 @@ function resolveUrl(base, href) {
     return base + href;
   }
 }
-baseUrls = {};
-originIndependentUrl = /^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;
+var baseUrls = {};
+var originIndependentUrl = /^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;
 
 function noop() {}
 noop.exec = noop;