diff --git a/admin/editor-js.php b/admin/editor-js.php
index 037e5185..851f65e3 100644
--- a/admin/editor-js.php
+++ b/admin/editor-js.php
@@ -128,16 +128,16 @@ $(document).ready(function () {
     var input = $('#text'), th = textarea.height();
 
     editor.hooks.chain('enterFakeFullScreen', function () {
-        var height = Math.max(document.documentElement.clientHeight, document.body.clientHeight);
+        var height = window.innerHeight || document.body.clientHeight || document.documentElement.clientHeight;
 
         th = textarea.height();
         $(document.body).addClass('fullscreen');
-        textarea.css('height', height - 52);
+        textarea.css('height', height - toolbar.outerHeight());
     });
 
     editor.hooks.chain('enterFullScreen', function () {
         $(document.body).addClass('fullscreen');
-        textarea.css('height', window.screen.height - 52);
+        textarea.css('height', window.screen.height - toolbar.outerHeight());
     });
 
     editor.hooks.chain('exitFullScreen', function () {