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diff --git a/src/include/catalog/pg_largeobject.h b/src/include/catalog/pg_largeobject.h
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+/*-------------------------------------------------------------------------
+ *
+ * pg_largeobject.h
+ * definition of the "large object" system catalog (pg_largeobject)
+ *
+ *
+ * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/catalog/pg_largeobject.h
+ *
+ * NOTES
+ * The Catalog.pm module reads this file and derives schema
+ * information.
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_LARGEOBJECT_H
+#define PG_LARGEOBJECT_H
+
+#include "catalog/genbki.h"
+#include "catalog/pg_largeobject_d.h"
+
+/* ----------------
+ * pg_largeobject definition. cpp turns this into
+ * typedef struct FormData_pg_largeobject
+ * ----------------
+ */
+CATALOG(pg_largeobject,2613,LargeObjectRelationId)
+{
+ Oid loid BKI_LOOKUP(pg_largeobject_metadata); /* Identifier of large
+ * object */
+ int32 pageno; /* Page number (starting from 0) */
+
+ /* data has variable length, but we allow direct access; see inv_api.c */
+ bytea data BKI_FORCE_NOT_NULL; /* Data for page (may be
+ * zero-length) */
+} FormData_pg_largeobject;
+
+/* ----------------
+ * Form_pg_largeobject corresponds to a pointer to a tuple with
+ * the format of pg_largeobject relation.
+ * ----------------
+ */
+typedef FormData_pg_largeobject *Form_pg_largeobject;
+
+DECLARE_UNIQUE_INDEX_PKEY(pg_largeobject_loid_pn_index, 2683, LargeObjectLOidPNIndexId, on pg_largeobject using btree(loid oid_ops, pageno int4_ops));
+
+extern Oid LargeObjectCreate(Oid loid);
+extern void LargeObjectDrop(Oid loid);
+extern bool LargeObjectExists(Oid loid);
+
+#endif /* PG_LARGEOBJECT_H */