diff --git a/phpgwapi/inc/class.schema_proc.inc.php b/phpgwapi/inc/class.schema_proc.inc.php
index 644d56b8c7..726a94ec6a 100644
--- a/phpgwapi/inc/class.schema_proc.inc.php
+++ b/phpgwapi/inc/class.schema_proc.inc.php
@@ -723,7 +723,7 @@ class schema_proc
 		else
 		{
 			// drop evtl. existing temp. table eg. from a previous failed upgrade
-			if (($tables = $this->db->table_names(true)) && in_array($tmp_name, $tables))
+			if (($tables = $this->m_odb->table_names(true)) && in_array($tmp_name, $tables))
 			{
 				$this->DropTable($tmp_name);
 			}