diff --git a/ext/odbc/tests/odbc_connect_001.phpt b/ext/odbc/tests/odbc_connect_001.phpt
index 7ab80afa81a73..e19a9fc3edd11 100644
--- a/ext/odbc/tests/odbc_connect_001.phpt
+++ b/ext/odbc/tests/odbc_connect_001.phpt
@@ -10,6 +10,8 @@ if (strpos($dsn, '=') === false) {
 }
 include 'skipif.inc';
 ?>
+--XLEAK--
+A bug in msodbcsql causes a memory leak when reconnecting after closing. See GH-12306
 --FILE--
 <?php
 
diff --git a/ext/pdo_odbc/tests/basic_connection.phpt b/ext/pdo_odbc/tests/basic_connection.phpt
index 255eb03516ff6..f4120ae1fc1b9 100644
--- a/ext/pdo_odbc/tests/basic_connection.phpt
+++ b/ext/pdo_odbc/tests/basic_connection.phpt
@@ -11,6 +11,8 @@ if (!$dsn || strpos($dsn, '=') === false) {
     die('skip');
 }
 ?>
+--XLEAK--
+A bug in msodbcsql causes a memory leak when reconnecting after closing. See GH-12306
 --FILE--
 <?php
 $dsnWithCredentials = getenv('PDO_ODBC_TEST_DSN');