diff --git a/lib/ace/editor.js b/lib/ace/editor.js
index aaacbf46..049f63d8 100644
--- a/lib/ace/editor.js
+++ b/lib/ace/editor.js
@@ -344,8 +344,8 @@ var Editor = function(renderer, session) {
      * Gets the current font size of the editor text.
      */
     this.getFontSize = function () {
-        return this.setOption("fontSize") ||
-           dom.computedStyle(ace.container, "fontSize")
+        return this.getOption("fontSize") ||
+           dom.computedStyle(this.container, "fontSize");
     };
 
     /**