diff --git a/ext/pdo_odbc/odbc_driver.c b/ext/pdo_odbc/odbc_driver.c
index 69ce9dde532..8f178ef7198 100644
--- a/ext/pdo_odbc/odbc_driver.c
+++ b/ext/pdo_odbc/odbc_driver.c
@@ -513,7 +513,7 @@ static int pdo_odbc_handle_factory(pdo_dbh_t *dbh, zval *driver_options) /* {{{
 				*db_end = '\0';
 			}
 
-			char *uid = NULL, *pwd = NULL, *dsn;
+			char *uid = NULL, *pwd = NULL, *dsn = NULL;
 			bool should_quote_uid, should_quote_pwd;
 			size_t new_dsn_size;