diff --git a/pgtype/pgtype.go b/pgtype/pgtype.go
index f6cc2d43..a6d77356 100644
--- a/pgtype/pgtype.go
+++ b/pgtype/pgtype.go
@@ -60,6 +60,7 @@ const (
 	BoxArrayOID         = 1020
 	Float4ArrayOID      = 1021
 	Float8ArrayOID      = 1022
+	PolygonArrayOID     = 1027
 	OIDArrayOID         = 1028
 	ACLItemOID          = 1033
 	ACLItemArrayOID     = 1034
@@ -281,6 +282,7 @@ func NewConnInfo() *ConnInfo {
 	ci.RegisterDataType(DataType{Name: "_path", OID: PathArrayOID, Codec: &ArrayCodec{ElementCodec: PathCodec{}, ElementOID: PathOID}})
 	ci.RegisterDataType(DataType{Name: "_circle", OID: CircleArrayOID, Codec: &ArrayCodec{ElementCodec: CircleCodec{}, ElementOID: CircleOID}})
 	ci.RegisterDataType(DataType{Name: "_point", OID: PointArrayOID, Codec: &ArrayCodec{ElementCodec: PointCodec{}, ElementOID: PointOID}})
+	ci.RegisterDataType(DataType{Name: "_polygon", OID: PolygonArrayOID, Codec: &ArrayCodec{ElementCodec: PolygonCodec{}, ElementOID: PolygonOID}})
 	ci.RegisterDataType(DataType{Name: "_name", OID: NameArrayOID, Codec: &ArrayCodec{ElementCodec: TextCodec{}, ElementOID: NameOID}})
 	ci.RegisterDataType(DataType{Value: &NumericArray{}, Name: "_numeric", OID: NumericArrayOID})
 	ci.RegisterDataType(DataType{Name: "_text", OID: TextArrayOID, Codec: &ArrayCodec{ElementCodec: TextCodec{}, ElementOID: TextOID}})