diff --git a/ext/pgsql/pgsql.c b/ext/pgsql/pgsql.c
index be2eeef2eb1..7bc61bed81d 100644
--- a/ext/pgsql/pgsql.c
+++ b/ext/pgsql/pgsql.c
@@ -2633,7 +2633,7 @@ PHP_FUNCTION(pg_lo_export)
 
 	/* allow string to handle large OID value correctly */
 	if (zend_parse_parameters_ex(ZEND_PARSE_PARAMS_QUIET, ZEND_NUM_ARGS(),
-								 "rlP", &pgsql_link, pgsql_link_ce, &oid_long, &file_out) == SUCCESS) {
+								 "OlP", &pgsql_link, pgsql_link_ce, &oid_long, &file_out) == SUCCESS) {
 		if (oid_long <= (zend_long)InvalidOid) {
 			zend_value_error("Invalid OID value passed");
 			RETURN_THROWS();