diff --git a/lib/swig.js b/lib/swig.js
index c9085242..0f794945 100644
--- a/lib/swig.js
+++ b/lib/swig.js
@@ -486,7 +486,7 @@ exports.Swig = function (opts) {
    * @return {string}           Rendered output.
    */
   this.render = function (source, options) {
-    return this.compile(source, options)();
+    return self.compile(source, options)();
   };
 
   /**
@@ -511,7 +511,7 @@ exports.Swig = function (opts) {
    */
   this.renderFile = function (pathName, locals, cb) {
     if (cb) {
-      this.compileFile(pathName, {}, function (err, fn) {
+      self.compileFile(pathName, {}, function (err, fn) {
         if (err) {
           cb(err);
           return;
@@ -521,7 +521,7 @@ exports.Swig = function (opts) {
       return;
     }
 
-    return this.compileFile(pathName)(locals);
+    return self.compileFile(pathName)(locals);
   };
 
   /**