diff --git a/phpBB/includes/acp/acp_database.php b/phpBB/includes/acp/acp_database.php
index 7fd959b104..59ccb342fd 100644
--- a/phpBB/includes/acp/acp_database.php
+++ b/phpBB/includes/acp/acp_database.php
@@ -68,7 +68,7 @@ class acp_database
 
 						@set_time_limit(1200);
 
-						$filename = time();
+						$filename = 'backup_' . time();
 
 						// We set up the info needed for our on-the-fly creation :D
 						switch ($format)
@@ -1162,7 +1162,7 @@ class acp_database
 						$delete = request_var('delete', '');
 						$file = request_var('file', '');
 
-						preg_match('#^(\d{10})\.(sql(?:\.(?:gz|bz2))?)$#', $file, $matches);
+						preg_match('#^(backup_\d{10,})\.(sql(?:\.(?:gz|bz2))?)$#', $file, $matches);
 						$file_name = $phpbb_root_path . 'store/' . $matches[0];
 
 						if (!(file_exists($file_name) && is_readable($file_name)))
@@ -1284,7 +1284,7 @@ class acp_database
 						$dh = opendir($dir);
 						while (($file = readdir($dh)) !== false)
 						{
-							if (preg_match('#^(\d{10})\.(sql(?:\.(?:gz|bz2))?)$#', $file, $matches))
+							if (preg_match('#^backup_(\d{10,})\.(sql(?:\.(?:gz|bz2))?)$#', $file, $matches))
 							{
 								$supported = in_array($matches[2], $methods);