diff --git a/ext/pdo_mysql/mysql_driver.c b/ext/pdo_mysql/mysql_driver.c
index c73f4d2939b..538cf097256 100755
--- a/ext/pdo_mysql/mysql_driver.c
+++ b/ext/pdo_mysql/mysql_driver.c
@@ -233,9 +233,8 @@ static long mysql_handle_doer(pdo_dbh_t *dbh, const char *sql, long sql_len TSRM
 static char *pdo_mysql_last_insert_id(pdo_dbh_t *dbh, const char *name, unsigned int *len TSRMLS_DC)
 {
 	pdo_mysql_db_handle *H = (pdo_mysql_db_handle *)dbh->driver_data;
-	char *id = NULL;
-
-	*len = spprintf(&id, 0, "%lld", mysql_insert_id(H->server));
+	char *id = php_pdo_int64_to_str(mysql_insert_id(H->server) TSRMLS_CC);
+	*len = strlen(id);
 	return id;
 }