diff --git a/inc/instance-config.php b/inc/instance-config.php
index a5475db9..109c796c 100644
--- a/inc/instance-config.php
+++ b/inc/instance-config.php
@@ -112,6 +112,9 @@ $config['max_combining_chars'] = 3;
 
 //Banners
 $config['url_banner'] = '/banners.php';
+// Fixed size prevents things moving as page loads
+$config['banner_width'] = 300;
+$config['banner_height'] = 100;
 
 //Logo location for themes
 $config['logo'] = 'static/leftypol_logo.png';