diff --git a/phpBB/includes/ucp/ucp_pm_compose.php b/phpBB/includes/ucp/ucp_pm_compose.php
index 4ff27e8cf1..61dab982df 100644
--- a/phpBB/includes/ucp/ucp_pm_compose.php
+++ b/phpBB/includes/ucp/ucp_pm_compose.php
@@ -55,7 +55,6 @@ function compose_pm($id, $mode, $action, $user_folders = array())
 
 	$address_list	= $request->variable('address_list', array('' => array(0 => '')));
 
-	$submit		= (isset($_POST['post'])) ? true : false;
 	$preview	= (isset($_POST['preview'])) ? true : false;
 	$save		= (isset($_POST['save'])) ? true : false;
 	$load		= (isset($_POST['load'])) ? true : false;
@@ -69,6 +68,7 @@ function compose_pm($id, $mode, $action, $user_folders = array())
 
 	$refresh	= isset($_POST['add_file']) || isset($_POST['delete_file']) || $save || $load
 		|| $remove_u || $remove_g || $add_to || $add_bcc;
+	$submit = $request->is_set_post('post') && !$refresh && !$preview;
 
 	$action		= ($delete && !$preview && !$refresh && $submit) ? 'delete' : $action;
 	$select_single = ($config['allow_mass_pm'] && $auth->acl_get('u_masspm')) ? false : true;
diff --git a/phpBB/posting.php b/phpBB/posting.php
index cba967779f..4a8da8e7ce 100644
--- a/phpBB/posting.php
+++ b/phpBB/posting.php
@@ -35,7 +35,6 @@ $forum_id	= $request->variable('f', 0);
 $draft_id	= $request->variable('d', 0);
 $lastclick	= $request->variable('lastclick', 0);
 
-$submit		= (isset($_POST['post'])) ? true : false;
 $preview	= (isset($_POST['preview'])) ? true : false;
 $save		= (isset($_POST['save'])) ? true : false;
 $load		= (isset($_POST['load'])) ? true : false;
@@ -43,6 +42,7 @@ $confirm	= $request->is_set_post('confirm');
 $cancel		= (isset($_POST['cancel']) && !isset($_POST['save'])) ? true : false;
 
 $refresh	= (isset($_POST['add_file']) || isset($_POST['delete_file']) || isset($_POST['cancel_unglobalise']) || $save || $load || $preview);
+$submit = $request->is_set_post('post') && !$refresh && !$preview;
 $mode		= $request->variable('mode', '');
 
 // If the user is not allowed to delete the post, we try to soft delete it, so we overwrite the mode here.