diff --git a/buildfiles/r.js b/buildfiles/r.js
index a46ed12..3d04ae1 100644
--- a/buildfiles/r.js
+++ b/buildfiles/r.js
@@ -89,7 +89,7 @@ var requirejs, require, define;
         };
 
         exists = function (fileName) {
-            return path.existsSync(fileName);
+            return fs.existsSync(fileName);
         };
 
 
@@ -2263,7 +2263,7 @@ var requirejs, require, define;
         //Indicate a the module is in process of loading.
         context.scriptCount += 1;
 
-        if (path.existsSync(url)) {
+        if (fs.existsSync(url)) {
             contents = fs.readFileSync(url, 'utf8');
 
             contents = req.makeNodeWrapper(contents);