diff --git a/schema/field/field_test.go b/schema/field/field_test.go
index fb74a7045..a5632cea1 100644
--- a/schema/field/field_test.go
+++ b/schema/field/field_test.go
@@ -62,6 +62,30 @@ func TestInt(t *testing.T) {
 	assert.Equal(t, field.TypeUint16, field.Uint16("age").Descriptor().Info.Type)
 	assert.Equal(t, field.TypeUint32, field.Uint32("age").Descriptor().Info.Type)
 	assert.Equal(t, field.TypeUint64, field.Uint64("age").Descriptor().Info.Type)
+
+	type Count int
+	fd = field.Int("active").GoType(Count(0)).Descriptor()
+	assert.NoError(t, fd.Err())
+	assert.Equal(t, "field_test.Count", fd.Info.Ident)
+	assert.Equal(t, "github.com/facebookincubator/ent/schema/field_test", fd.Info.PkgPath)
+	assert.Equal(t, "field_test.Count", fd.Info.String())
+	assert.False(t, fd.Info.Nillable)
+	assert.False(t, fd.Info.ValueScanner())
+
+	fd = field.Int("count").GoType(&sql.NullInt64{}).Descriptor()
+	assert.NoError(t, fd.Err())
+	assert.Equal(t, "sql.NullInt64", fd.Info.Ident)
+	assert.Equal(t, "database/sql", fd.Info.PkgPath)
+	assert.Equal(t, "sql.NullInt64", fd.Info.String())
+	assert.True(t, fd.Info.Nillable)
+	assert.True(t, fd.Info.ValueScanner())
+
+	fd = field.Int("count").GoType(false).Descriptor()
+	assert.Error(t, fd.Err())
+	fd = field.Int("count").GoType(struct{}{}).Descriptor()
+	assert.Error(t, fd.Err())
+	fd = field.Int("count").GoType(new(Count)).Descriptor()
+	assert.Error(t, fd.Err())
 }
 
 func TestFloat(t *testing.T) {
diff --git a/schema/field/gen/numeric.tmpl b/schema/field/gen/numeric.tmpl
index 1439d5c00..63be9bdb5 100644
--- a/schema/field/gen/numeric.tmpl
+++ b/schema/field/gen/numeric.tmpl
@@ -5,7 +5,10 @@
 
 package field
 
-import "errors"
+import (
+	"errors"
+	"reflect"
+)
 
 //go:generate go run gen/gen.go
 
@@ -33,7 +36,7 @@ func Float32(name string) *float32Builder { return &float32Builder{&Descriptor{
 	}}
 }
 
-{{ range $_, $t := $.Ints }}
+{{ range $t := $.Ints }}
 {{ $builder := printf "%sBuilder" $t }}
 
 // {{ $builder }} is the builder for {{ $t }} field.
@@ -160,6 +163,17 @@ func (b *{{ $builder }}) SchemaType(types map[string]string) *{{ $builder }} {
 	return b
 }
 
+{{ $tt := title $t.String }}
+// GoType overrides the default Go type with a custom one.
+//
+//	field.{{ $tt }}("{{ $t }}").
+//		GoType(pkg.{{ $tt }}(0))
+//
+func (b *{{ $builder }}) GoType(typ interface{}) *{{ $builder }} {
+	b.desc.goType(typ, {{ $t }}Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *{{ $builder }}) Descriptor() *Descriptor {
 	return b.desc
@@ -167,6 +181,12 @@ func (b *{{ $builder }}) Descriptor() *Descriptor {
 
 {{ end }}
 
+var (
+	{{- range $t := $.Ints }}
+		{{ $t }}Type = reflect.TypeOf({{ $t }}(0))
+	{{- end }}
+)
+
 {{ range $t := $.Floats }}
 {{ $builder := printf "%sBuilder" $t }}
 
diff --git a/schema/field/numeric.go b/schema/field/numeric.go
index 20937d285..7e7fd4f6a 100644
--- a/schema/field/numeric.go
+++ b/schema/field/numeric.go
@@ -4,7 +4,10 @@
 
 package field
 
-import "errors"
+import (
+	"errors"
+	"reflect"
+)
 
 //go:generate go run gen/gen.go
 
@@ -226,6 +229,16 @@ func (b *intBuilder) SchemaType(types map[string]string) *intBuilder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Int("int").
+//		GoType(pkg.Int(0))
+//
+func (b *intBuilder) GoType(typ interface{}) *intBuilder {
+	b.desc.goType(typ, intType)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *intBuilder) Descriptor() *Descriptor {
 	return b.desc
@@ -343,6 +356,16 @@ func (b *uintBuilder) SchemaType(types map[string]string) *uintBuilder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Uint("uint").
+//		GoType(pkg.Uint(0))
+//
+func (b *uintBuilder) GoType(typ interface{}) *uintBuilder {
+	b.desc.goType(typ, uintType)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *uintBuilder) Descriptor() *Descriptor {
 	return b.desc
@@ -470,6 +493,16 @@ func (b *int8Builder) SchemaType(types map[string]string) *int8Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Int8("int8").
+//		GoType(pkg.Int8(0))
+//
+func (b *int8Builder) GoType(typ interface{}) *int8Builder {
+	b.desc.goType(typ, int8Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *int8Builder) Descriptor() *Descriptor {
 	return b.desc
@@ -597,6 +630,16 @@ func (b *int16Builder) SchemaType(types map[string]string) *int16Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Int16("int16").
+//		GoType(pkg.Int16(0))
+//
+func (b *int16Builder) GoType(typ interface{}) *int16Builder {
+	b.desc.goType(typ, int16Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *int16Builder) Descriptor() *Descriptor {
 	return b.desc
@@ -724,6 +767,16 @@ func (b *int32Builder) SchemaType(types map[string]string) *int32Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Int32("int32").
+//		GoType(pkg.Int32(0))
+//
+func (b *int32Builder) GoType(typ interface{}) *int32Builder {
+	b.desc.goType(typ, int32Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *int32Builder) Descriptor() *Descriptor {
 	return b.desc
@@ -851,6 +904,16 @@ func (b *int64Builder) SchemaType(types map[string]string) *int64Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Int64("int64").
+//		GoType(pkg.Int64(0))
+//
+func (b *int64Builder) GoType(typ interface{}) *int64Builder {
+	b.desc.goType(typ, int64Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *int64Builder) Descriptor() *Descriptor {
 	return b.desc
@@ -968,6 +1031,16 @@ func (b *uint8Builder) SchemaType(types map[string]string) *uint8Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Uint8("uint8").
+//		GoType(pkg.Uint8(0))
+//
+func (b *uint8Builder) GoType(typ interface{}) *uint8Builder {
+	b.desc.goType(typ, uint8Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *uint8Builder) Descriptor() *Descriptor {
 	return b.desc
@@ -1085,6 +1158,16 @@ func (b *uint16Builder) SchemaType(types map[string]string) *uint16Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Uint16("uint16").
+//		GoType(pkg.Uint16(0))
+//
+func (b *uint16Builder) GoType(typ interface{}) *uint16Builder {
+	b.desc.goType(typ, uint16Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *uint16Builder) Descriptor() *Descriptor {
 	return b.desc
@@ -1202,6 +1285,16 @@ func (b *uint32Builder) SchemaType(types map[string]string) *uint32Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Uint32("uint32").
+//		GoType(pkg.Uint32(0))
+//
+func (b *uint32Builder) GoType(typ interface{}) *uint32Builder {
+	b.desc.goType(typ, uint32Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *uint32Builder) Descriptor() *Descriptor {
 	return b.desc
@@ -1319,11 +1412,34 @@ func (b *uint64Builder) SchemaType(types map[string]string) *uint64Builder {
 	return b
 }
 
+// GoType overrides the default Go type with a custom one.
+//
+//	field.Uint64("uint64").
+//		GoType(pkg.Uint64(0))
+//
+func (b *uint64Builder) GoType(typ interface{}) *uint64Builder {
+	b.desc.goType(typ, uint64Type)
+	return b
+}
+
 // Descriptor implements the ent.Field interface by returning its descriptor.
 func (b *uint64Builder) Descriptor() *Descriptor {
 	return b.desc
 }
 
+var (
+	intType    = reflect.TypeOf(int(0))
+	uintType   = reflect.TypeOf(uint(0))
+	int8Type   = reflect.TypeOf(int8(0))
+	int16Type  = reflect.TypeOf(int16(0))
+	int32Type  = reflect.TypeOf(int32(0))
+	int64Type  = reflect.TypeOf(int64(0))
+	uint8Type  = reflect.TypeOf(uint8(0))
+	uint16Type = reflect.TypeOf(uint16(0))
+	uint32Type = reflect.TypeOf(uint32(0))
+	uint64Type = reflect.TypeOf(uint64(0))
+)
+
 // float64Builder is the builder for float fields.
 type float64Builder struct {
 	desc *Descriptor