diff --git a/phpBB/includes/acp/acp_prune.php b/phpBB/includes/acp/acp_prune.php
index 78db1eff15..5d9080b55b 100644
--- a/phpBB/includes/acp/acp_prune.php
+++ b/phpBB/includes/acp/acp_prune.php
@@ -331,23 +331,30 @@ class acp_prune
 			$s_find_active_time .= '<option value="' . $key . '">' . $value . '</option>';
 		}
 
-		$s_group_list = '<option value="0"></option>';
 		$sql = 'SELECT group_id, group_name
 			FROM ' . GROUPS_TABLE . '
 			WHERE group_type <> ' . GROUP_SPECIAL . '
 			ORDER BY group_name ASC';
 		$result = $db->sql_query($sql);
 
+		$s_group_list = '';
 		while ($row = $db->sql_fetchrow($result))
 		{
 			$s_group_list .= '<option value="' . $row['group_id'] . '">' . $row['group_name'] . '</option>';
 		}
 		$db->sql_freeresult($result);
 
+		if ($s_group_list)
+		{
+			// Only prepend the "All groups" option if there are groups,
+			// otherwise we don't want to display this option at all.
+			$s_group_list = '<option value="0">' . $user->lang['PRUNE_USERS_GROUP_NONE'] . '</option>' . $s_group_list;
+		}
+
 		$template->assign_vars(array(
 			'U_ACTION'			=> $this->u_action,
 			'S_ACTIVE_OPTIONS'	=> $s_find_active_time,
-			'S_GROUP_LIST'      => $s_group_list,
+			'S_GROUP_LIST'		=> $s_group_list,
 			'S_COUNT_OPTIONS'	=> $s_find_count,
 			'U_FIND_USERNAME'	=> append_sid("{$phpbb_root_path}memberlist.$phpEx", 'mode=searchuser&amp;form=acp_prune&amp;field=users'),
 		));
diff --git a/phpBB/language/en/acp/prune.php b/phpBB/language/en/acp/prune.php
index 3e890182c0..7134efd765 100644
--- a/phpBB/language/en/acp/prune.php
+++ b/phpBB/language/en/acp/prune.php
@@ -52,6 +52,7 @@ $lang = array_merge($lang, array(
 
 	'POSTS_ON_QUEUE'			=> 'Posts Awaiting Approval',
 	'PRUNE_USERS_GROUP_EXPLAIN'	=> 'Limit to users within the selected group.',
+	'PRUNE_USERS_GROUP_NONE'	=> 'All groups',
 	'PRUNE_USERS_LIST'				=> 'Users to be pruned',
 	'PRUNE_USERS_LIST_DELETE'		=> 'With the selected critera for pruning users the following accounts will be removed. You can remove individual users from the deletion list by unchecking the box next to their username.',
 	'PRUNE_USERS_LIST_DEACTIVATE'	=> 'With the selected critera for pruning users the following accounts will be deactivated. You can remove individual users from the deactivation list by unchecking the box next to their username.',