diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 12cbaa0f92..e81a76c533 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -1635,7 +1635,7 @@ function wp_tiny_mce( $teeny = false, $settings = false ) {
 			$val = $v ? 'true' : 'false';
 			$mce_options .= $k . ':' . $val . ', ';
 			continue;
-		} elseif ( !empty($v) && is_string($v) && ( '{' == $v{0} || '[' == $v{0} ) ) {
+		} elseif ( !empty($v) && is_string($v) && ( '{' == $v{0} || '[' == $v{0} || preg_match('/^\(?function ?\(/', $v) ) ) {
 			$mce_options .= $k . ':' . $v . ', ';
 			continue;
 		}
@@ -1700,4 +1700,4 @@ function wp_tiny_mce_preload_dialogs() { ?>
 	<div id="preloaded-dialogs" style="display:none;">
 <?php 	do_action('tiny_mce_preload_dialogs'); ?>
 	</div>
-<?php }
\ No newline at end of file
+<?php }