diff --git a/phpBB/adm/style/install_update_diff.html b/phpBB/adm/style/install_update_diff.html
index 4d8bcfd1fc..922b4aca31 100644
--- a/phpBB/adm/style/install_update_diff.html
+++ b/phpBB/adm/style/install_update_diff.html
@@ -15,12 +15,12 @@
 // <![CDATA[
 function resize_panel()
 {
-	var block = document.getElementById('codepanel');
+	var block = document.getElementById('diff_content');
 	var height;
 
 	if (window.innerHeight)
 	{
-		height = window.innerHeight - 150;
+		height = window.innerHeight - 200;
 		block.style.height = height + 'px';
 	}
 	else