diff --git a/go.mod b/go.mod
index 9cdc8fd34e1..337103d86ee 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,8 @@ require (
 	github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 // indirect
 	github.com/coreos/go-semver v0.2.0
 	github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf
-	github.com/dustin/go-humanize v0.0.0-20180421182945-02af3965c54e
+	github.com/docker/go-units v0.4.0
+	github.com/dustin/go-humanize v0.0.0-20180421182945-02af3965c54e // indirect
 	github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385 // indirect
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32
 	github.com/gogo/protobuf v1.0.0
diff --git a/go.sum b/go.sum
index 398ffcab422..91163e22e7b 100644
--- a/go.sum
+++ b/go.sum
@@ -21,6 +21,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
+github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/dustin/go-humanize v0.0.0-20180421182945-02af3965c54e h1:Fw7ZmgiklsLh5EQWyHh1sumKSCG1+yjEctIpGKib87s=
 github.com/dustin/go-humanize v0.0.0-20180421182945-02af3965c54e/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
diff --git a/pkg/typeutil/size.go b/pkg/typeutil/size.go
index 3b58c73ccfa..efbc52dba9b 100644
--- a/pkg/typeutil/size.go
+++ b/pkg/typeutil/size.go
@@ -16,7 +16,7 @@ package typeutil
 import (
 	"strconv"
 
-	gh "github.com/dustin/go-humanize"
+	"github.com/docker/go-units"
 	"github.com/pkg/errors"
 )
 
@@ -25,7 +25,7 @@ type ByteSize uint64
 
 // MarshalJSON returns the size as a JSON string.
 func (b ByteSize) MarshalJSON() ([]byte, error) {
-	return []byte(`"` + gh.IBytes(uint64(b)) + `"`), nil
+	return []byte(`"` + units.BytesSize(float64(b)) + `"`), nil
 }
 
 // UnmarshalJSON parses a JSON string into the bytesize.
@@ -34,7 +34,7 @@ func (b *ByteSize) UnmarshalJSON(text []byte) error {
 	if err != nil {
 		return errors.WithStack(err)
 	}
-	v, err := gh.ParseBytes(s)
+	v, err := units.RAMInBytes(s)
 	if err != nil {
 		return errors.WithStack(err)
 	}
@@ -44,7 +44,7 @@ func (b *ByteSize) UnmarshalJSON(text []byte) error {
 
 // UnmarshalText parses a Toml string into the bytesize.
 func (b *ByteSize) UnmarshalText(text []byte) error {
-	v, err := gh.ParseBytes(string(text))
+	v, err := units.RAMInBytes(string(text))
 	if err != nil {
 		return errors.WithStack(err)
 	}
diff --git a/pkg/typeutil/size_test.go b/pkg/typeutil/size_test.go
index 5102213352b..54be8893bf1 100644
--- a/pkg/typeutil/size_test.go
+++ b/pkg/typeutil/size_test.go
@@ -37,4 +37,9 @@ func (s *testSizeSuite) TestJSON(c *C) {
 	var nb ByteSize
 	err = json.Unmarshal(o, &nb)
 	c.Assert(err, IsNil)
+
+	b = ByteSize(1756821276000)
+	o, err = json.Marshal(b)
+	c.Assert(err, IsNil)
+	c.Assert(string(o), Equals, `"1.598TiB"`)
 }
diff --git a/server/api/store_test.go b/server/api/store_test.go
index dccd56bdd17..0daffe3bd27 100644
--- a/server/api/store_test.go
+++ b/server/api/store_test.go
@@ -14,6 +14,7 @@
 package api
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -22,6 +23,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/docker/go-units"
 	. "github.com/pingcap/check"
 	"github.com/pingcap/kvproto/pkg/metapb"
 	"github.com/pingcap/kvproto/pkg/pdpb"
@@ -134,9 +136,26 @@ func (s *testStoreSuite) TestStoresList(c *C) {
 
 func (s *testStoreSuite) TestStoreGet(c *C) {
 	url := fmt.Sprintf("%s/store/1", s.urlPrefix)
+	s.svr.StoreHeartbeat(
+		context.Background(), &pdpb.StoreHeartbeatRequest{
+			Header: &pdpb.RequestHeader{ClusterId: s.svr.ClusterID()},
+			Stats: &pdpb.StoreStats{
+				StoreId:   1,
+				Capacity:  1798985089024,
+				Available: 1709868695552,
+				UsedSize:  85150956358,
+			},
+		},
+	)
+
 	info := new(StoreInfo)
 	err := readJSONWithURL(url, info)
+
 	c.Assert(err, IsNil)
+	capacity, _ := units.RAMInBytes("1.636TiB")
+	available, _ := units.RAMInBytes("1.555TiB")
+	c.Assert(int64(info.Status.Capacity), Equals, capacity)
+	c.Assert(int64(info.Status.Available), Equals, available)
 	checkStoresInfo(c, []*StoreInfo{info}, s.stores[:1])
 }