diff --git a/mysql/type.go b/mysql/type.go
index 9ea32f90d..418e9b7d3 100644
--- a/mysql/type.go
+++ b/mysql/type.go
@@ -15,17 +15,17 @@ package mysql
 
 // MySQL type information.
 const (
-	TypeDecimal   byte = 0
-	TypeTiny      byte = 1
-	TypeShort     byte = 2
-	TypeLong      byte = 3
-	TypeFloat     byte = 4
-	TypeDouble    byte = 5
-	TypeNull      byte = 6
-	TypeTimestamp byte = 7
-	TypeLonglong  byte = 8
-	TypeInt24     byte = 9
-	TypeDate      byte = 10
+	TypeUnspecified byte = 0
+	TypeTiny        byte = 1
+	TypeShort       byte = 2
+	TypeLong        byte = 3
+	TypeFloat       byte = 4
+	TypeDouble      byte = 5
+	TypeNull        byte = 6
+	TypeTimestamp   byte = 7
+	TypeLonglong    byte = 8
+	TypeInt24       byte = 9
+	TypeDate        byte = 10
 	/* TypeDuration original name was TypeTime, renamed to TypeDuration to resolve the conflict with Go type Time.*/
 	TypeDuration byte = 11
 	TypeDatetime byte = 12
@@ -47,9 +47,6 @@ const (
 	TypeGeometry   byte = 0xff
 )
 
-// TypeUnspecified is an uninitialized type. TypeDecimal is not used in MySQL.
-const TypeUnspecified = TypeDecimal
-
 // Flag information.
 const (
 	NotNullFlag        uint = 1 << 0  /* Field can't be NULL */
diff --git a/types/etc.go b/types/etc.go
index 5925d6764..8696557bc 100644
--- a/types/etc.go
+++ b/types/etc.go
@@ -41,33 +41,33 @@ func IsTypeChar(tp byte) bool {
 }
 
 var type2Str = map[byte]string{
-	mysql.TypeBit:        "bit",
-	mysql.TypeBlob:       "text",
-	mysql.TypeDate:       "date",
-	mysql.TypeDatetime:   "datetime",
-	mysql.TypeDecimal:    "unspecified",
-	mysql.TypeNewDecimal: "decimal",
-	mysql.TypeDouble:     "double",
-	mysql.TypeEnum:       "enum",
-	mysql.TypeFloat:      "float",
-	mysql.TypeGeometry:   "geometry",
-	mysql.TypeInt24:      "mediumint",
-	mysql.TypeJSON:       "json",
-	mysql.TypeLong:       "int",
-	mysql.TypeLonglong:   "bigint",
-	mysql.TypeLongBlob:   "longtext",
-	mysql.TypeMediumBlob: "mediumtext",
-	mysql.TypeNull:       "null",
-	mysql.TypeSet:        "set",
-	mysql.TypeShort:      "smallint",
-	mysql.TypeString:     "char",
-	mysql.TypeDuration:   "time",
-	mysql.TypeTimestamp:  "timestamp",
-	mysql.TypeTiny:       "tinyint",
-	mysql.TypeTinyBlob:   "tinytext",
-	mysql.TypeVarchar:    "varchar",
-	mysql.TypeVarString:  "var_string",
-	mysql.TypeYear:       "year",
+	mysql.TypeBit:         "bit",
+	mysql.TypeBlob:        "text",
+	mysql.TypeDate:        "date",
+	mysql.TypeDatetime:    "datetime",
+	mysql.TypeUnspecified: "unspecified",
+	mysql.TypeNewDecimal:  "decimal",
+	mysql.TypeDouble:      "double",
+	mysql.TypeEnum:        "enum",
+	mysql.TypeFloat:       "float",
+	mysql.TypeGeometry:    "geometry",
+	mysql.TypeInt24:       "mediumint",
+	mysql.TypeJSON:        "json",
+	mysql.TypeLong:        "int",
+	mysql.TypeLonglong:    "bigint",
+	mysql.TypeLongBlob:    "longtext",
+	mysql.TypeMediumBlob:  "mediumtext",
+	mysql.TypeNull:        "null",
+	mysql.TypeSet:         "set",
+	mysql.TypeShort:       "smallint",
+	mysql.TypeString:      "char",
+	mysql.TypeDuration:    "time",
+	mysql.TypeTimestamp:   "timestamp",
+	mysql.TypeTiny:        "tinyint",
+	mysql.TypeTinyBlob:    "tinytext",
+	mysql.TypeVarchar:     "varchar",
+	mysql.TypeVarString:   "var_string",
+	mysql.TypeYear:        "year",
 }
 
 // TypeStr converts tp to a string.
diff --git a/types/field_type.go b/types/field_type.go
index 8864a6d73..8d9da67f6 100644
--- a/types/field_type.go
+++ b/types/field_type.go
@@ -218,7 +218,7 @@ func (ft *FieldType) Restore(ctx *format.RestoreCtx) error {
 		ctx.WritePlain(")")
 	case mysql.TypeTimestamp, mysql.TypeDatetime, mysql.TypeDuration:
 		precision = ft.Decimal
-	case mysql.TypeDecimal, mysql.TypeFloat, mysql.TypeDouble, mysql.TypeNewDecimal:
+	case mysql.TypeUnspecified, mysql.TypeFloat, mysql.TypeDouble, mysql.TypeNewDecimal:
 		precision = ft.Flen
 		scale = ft.Decimal
 	default: