diff --git a/apps/user_ldap/lib/Migration/Version1130Date20211102154716.php b/apps/user_ldap/lib/Migration/Version1130Date20211102154716.php
index 9ace5b2007072..3cdf9a7942379 100644
--- a/apps/user_ldap/lib/Migration/Version1130Date20211102154716.php
+++ b/apps/user_ldap/lib/Migration/Version1130Date20211102154716.php
@@ -69,7 +69,7 @@ public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array
 			// ldap_group_mapping_backup table. No need to recreate, but it
 			// should be empty.
 			// TRUNCATE is not available from Query Builder, but faster than DELETE FROM.
-			$sql = $this->dbc->getDatabasePlatform()->getTruncateTableSQL('ldap_group_mapping_backup', false);
+			$sql = $this->dbc->getDatabasePlatform()->getTruncateTableSQL('`*PREFIX*ldap_group_mapping_backup`', false);
 			$this->dbc->executeUpdate($sql);
 		}
 	}