diff --git a/helper/schema/schema.go b/helper/schema/schema.go
index f16df2d72..fc52548a4 100644
--- a/helper/schema/schema.go
+++ b/helper/schema/schema.go
@@ -11,8 +11,6 @@
 // A good starting point is to view the Provider structure.
 package schema
 
-//go:generate stringer -type=ValueType
-
 import (
 	"fmt"
 	"os"
@@ -25,47 +23,6 @@ import (
 	"github.com/mitchellh/mapstructure"
 )
 
-// ValueType is an enum of the type that can be represented by a schema.
-type ValueType int
-
-const (
-	TypeInvalid ValueType = iota
-	TypeBool
-	TypeInt
-	TypeFloat
-	TypeString
-	TypeList
-	TypeMap
-	TypeSet
-	typeObject
-)
-
-// Zero returns the zero value for a type.
-func (t ValueType) Zero() interface{} {
-	switch t {
-	case TypeInvalid:
-		return nil
-	case TypeBool:
-		return false
-	case TypeInt:
-		return 0
-	case TypeFloat:
-		return 0.0
-	case TypeString:
-		return ""
-	case TypeList:
-		return []interface{}{}
-	case TypeMap:
-		return map[string]interface{}{}
-	case TypeSet:
-		return nil
-	case typeObject:
-		return map[string]interface{}{}
-	default:
-		panic(fmt.Sprintf("unknown type %s", t))
-	}
-}
-
 // Schema is used to describe the structure of a value.
 //
 // Read the documentation of the struct elements for important details.
diff --git a/helper/schema/valuetype.go b/helper/schema/valuetype.go
new file mode 100644
index 000000000..b7b7ac810
--- /dev/null
+++ b/helper/schema/valuetype.go
@@ -0,0 +1,46 @@
+package schema
+
+//go:generate stringer -type=ValueType valuetype.go
+
+import "fmt"
+
+// ValueType is an enum of the type that can be represented by a schema.
+type ValueType int
+
+const (
+	TypeInvalid ValueType = iota
+	TypeBool
+	TypeInt
+	TypeFloat
+	TypeString
+	TypeList
+	TypeMap
+	TypeSet
+	typeObject
+)
+
+// Zero returns the zero value for a type.
+func (t ValueType) Zero() interface{} {
+	switch t {
+	case TypeInvalid:
+		return nil
+	case TypeBool:
+		return false
+	case TypeInt:
+		return 0
+	case TypeFloat:
+		return 0.0
+	case TypeString:
+		return ""
+	case TypeList:
+		return []interface{}{}
+	case TypeMap:
+		return map[string]interface{}{}
+	case TypeSet:
+		return nil
+	case typeObject:
+		return map[string]interface{}{}
+	default:
+		panic(fmt.Sprintf("unknown type %s", t))
+	}
+}
diff --git a/helper/schema/valuetype_string.go b/helper/schema/valuetype_string.go
index c011d3ec2..484a83963 100644
--- a/helper/schema/valuetype_string.go
+++ b/helper/schema/valuetype_string.go
@@ -1,4 +1,4 @@
-// generated by stringer -type=ValueType; DO NOT EDIT
+// generated by stringer -type=ValueType valuetype.go; DO NOT EDIT
 
 package schema
 
@@ -6,11 +6,16 @@ import "fmt"
 
 const _ValueType_name = "TypeInvalidTypeBoolTypeIntTypeFloatTypeStringTypeListTypeMapTypeSettypeObject"
 
-var _ValueType_index = [...]uint8{0, 11, 19, 26, 35, 45, 53, 60, 67, 77}
+var _ValueType_index = [...]uint8{11, 19, 26, 35, 45, 53, 60, 67, 77}
 
 func (i ValueType) String() string {
-	if i < 0 || i+1 >= ValueType(len(_ValueType_index)) {
+	if i < 0 || i >= ValueType(len(_ValueType_index)) {
 		return fmt.Sprintf("ValueType(%d)", i)
 	}
-	return _ValueType_name[_ValueType_index[i]:_ValueType_index[i+1]]
+	hi := _ValueType_index[i]
+	lo := uint8(0)
+	if i > 0 {
+		lo = _ValueType_index[i-1]
+	}
+	return _ValueType_name[lo:hi]
 }