diff --git a/lib/ace/editor.js b/lib/ace/editor.js
index 96baea30..b003146f 100644
--- a/lib/ace/editor.js
+++ b/lib/ace/editor.js
@@ -221,6 +221,7 @@ var Editor = function(renderer, session) {
 
     this.setFontSize = function(size) {
         this.container.style.fontSize = size;
+        this.renderer.updateFontSize();
     };
 
     this.$highlightBrackets = function() {