diff --git a/phpBB/adm/style/overall_header.html b/phpBB/adm/style/overall_header.html
index 7e7f0cecee..f5d0fda88a 100644
--- a/phpBB/adm/style/overall_header.html
+++ b/phpBB/adm/style/overall_header.html
@@ -110,7 +110,7 @@ function popup(url, width, height, name)
 
 </head>
 
-<body class="{S_CONTENT_DIRECTION} nojs">
+<body class="{S_CONTENT_DIRECTION} {BODY_CLASS} nojs">
 
 <!-- EVENT acp_overall_header_body_before -->
 
diff --git a/phpBB/adm/style/simple_header.html b/phpBB/adm/style/simple_header.html
index 770b7da8a6..fd5145f0d5 100644
--- a/phpBB/adm/style/simple_header.html
+++ b/phpBB/adm/style/simple_header.html
@@ -104,7 +104,7 @@ function find_username(url)
 <!-- EVENT acp_simple_header_head_append -->
 </head>
 
-<body class="{S_CONTENT_DIRECTION}">
+<body class="{S_CONTENT_DIRECTION} {BODY_CLASS}">
 
 <!-- EVENT acp_simple_header_body_before -->
 
diff --git a/phpBB/includes/functions_acp.php b/phpBB/includes/functions_acp.php
index cb44ed2794..37abab847a 100644
--- a/phpBB/includes/functions_acp.php
+++ b/phpBB/includes/functions_acp.php
@@ -63,6 +63,7 @@ function adm_page_header($page_title)
 	$template->assign_vars(array(
 		'PAGE_TITLE'			=> $page_title,
 		'USERNAME'				=> $user->data['username'],
+		'BODY_CLASS'			=> '',
 
 		'SID'					=> $SID,
 		'_SID'					=> $_SID,
