diff --git a/pgtype/zeronull/int2.go b/pgtype/zeronull/int2.go
index 81e89ab3..2f63d8cc 100644
--- a/pgtype/zeronull/int2.go
+++ b/pgtype/zeronull/int2.go
@@ -2,70 +2,32 @@ package zeronull
 
 import (
 	"database/sql/driver"
+	"fmt"
+	"math"
 
 	"github.com/jackc/pgx/v5/pgtype"
 )
 
 type Int2 int16
 
-func (dst *Int2) DecodeText(ci *pgtype.ConnInfo, src []byte) error {
-	var nullable pgtype.Int2
-	err := nullable.DecodeText(ci, src)
-	if err != nil {
-		return err
+// ScanInt64 implements the Int64Scanner interface.
+func (dst *Int2) ScanInt64(n int64, valid bool) error {
+	if !valid {
+		*dst = 0
+		return nil
 	}
 
-	if nullable.Valid {
-		*dst = Int2(nullable.Int)
-	} else {
-		*dst = 0
+	if n < math.MinInt16 {
+		return fmt.Errorf("%d is greater than maximum value for Int2", n)
 	}
+	if n > math.MaxInt16 {
+		return fmt.Errorf("%d is greater than maximum value for Int2", n)
+	}
+	*dst = Int2(n)
 
 	return nil
 }
 
-func (dst *Int2) DecodeBinary(ci *pgtype.ConnInfo, src []byte) error {
-	var nullable pgtype.Int2
-	err := nullable.DecodeBinary(ci, src)
-	if err != nil {
-		return err
-	}
-
-	if nullable.Valid {
-		*dst = Int2(nullable.Int)
-	} else {
-		*dst = 0
-	}
-
-	return nil
-}
-
-func (src Int2) EncodeText(ci *pgtype.ConnInfo, buf []byte) ([]byte, error) {
-	if src == 0 {
-		return nil, nil
-	}
-
-	nullable := pgtype.Int2{
-		Int:   int16(src),
-		Valid: true,
-	}
-
-	return nullable.EncodeText(ci, buf)
-}
-
-func (src Int2) EncodeBinary(ci *pgtype.ConnInfo, buf []byte) ([]byte, error) {
-	if src == 0 {
-		return nil, nil
-	}
-
-	nullable := pgtype.Int2{
-		Int:   int16(src),
-		Valid: true,
-	}
-
-	return nullable.EncodeBinary(ci, buf)
-}
-
 // Scan implements the database/sql Scanner interface.
 func (dst *Int2) Scan(src interface{}) error {
 	if src == nil {
@@ -86,5 +48,8 @@ func (dst *Int2) Scan(src interface{}) error {
 
 // Value implements the database/sql/driver Valuer interface.
 func (src Int2) Value() (driver.Value, error) {
-	return pgtype.EncodeValueText(src)
+	if src == 0 {
+		return nil, nil
+	}
+	return int64(src), nil
 }