diff --git a/phpBB/includes/acp/acp_database.php b/phpBB/includes/acp/acp_database.php
index ccb1460c8a..4034b36526 100644
--- a/phpBB/includes/acp/acp_database.php
+++ b/phpBB/includes/acp/acp_database.php
@@ -1387,6 +1387,10 @@ class acp_database
 						$kname = "UNIQUE|$kname";
 					}
 
+					if ($row['Sub_part'])
+					{
+						$row['Column_name'] .= '(' . $row['Sub_part'] . ')';
+					}
 					$index[$kname][] = $row['Column_name'];
 				}
 				$db->sql_freeresult($result);