diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 13d11023407..1f7c732c02c 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -279,7 +279,7 @@ static void MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel)
 static void MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel);
 static void StoreCatalogInheritance(Oid relationId, List *supers);
 static void StoreCatalogInheritance1(Oid relationId, Oid parentOid,
-						 int16 seqNumber, Relation inhRelation);
+						 int32 seqNumber, Relation inhRelation);
 static int	findAttrByName(const char *attributeName, List *schema);
 static void AlterIndexNamespaces(Relation classRel, Relation rel,
 				   Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved);
@@ -1977,7 +1977,7 @@ static void
 StoreCatalogInheritance(Oid relationId, List *supers)
 {
 	Relation	relation;
-	int16		seqNumber;
+	int32		seqNumber;
 	ListCell   *entry;
 
 	/*
@@ -2017,7 +2017,7 @@ StoreCatalogInheritance(Oid relationId, List *supers)
  */
 static void
 StoreCatalogInheritance1(Oid relationId, Oid parentOid,
-						 int16 seqNumber, Relation inhRelation)
+						 int32 seqNumber, Relation inhRelation)
 {
 	TupleDesc	desc = RelationGetDescr(inhRelation);
 	Datum		values[Natts_pg_inherits];
@@ -2031,7 +2031,7 @@ StoreCatalogInheritance1(Oid relationId, Oid parentOid,
 	 */
 	values[Anum_pg_inherits_inhrelid - 1] = ObjectIdGetDatum(relationId);
 	values[Anum_pg_inherits_inhparent - 1] = ObjectIdGetDatum(parentOid);
-	values[Anum_pg_inherits_inhseqno - 1] = Int16GetDatum(seqNumber);
+	values[Anum_pg_inherits_inhseqno - 1] = Int32GetDatum(seqNumber);
 
 	memset(nulls, 0, sizeof(nulls));