diff --git a/org.go b/org.go
index 0d2aa78..b31b399 100644
--- a/org.go
+++ b/org.go
@@ -3,7 +3,7 @@ package mackerel
 // Org information
 type Org struct {
 	Name        string `json:"name"`
-	DisplayName string `json:"displayName"`
+	DisplayName string `json:"displayName,omitempty"`
 }
 
 // GetOrg gets the org.
diff --git a/org_test.go b/org_test.go
index ab32cba..10f6ccd 100644
--- a/org_test.go
+++ b/org_test.go
@@ -9,6 +9,37 @@ import (
 )
 
 func TestGetOrg(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
+		if req.URL.Path != "/api/v0/org" {
+			t.Error("request URL should be /api/v0/org but: ", req.URL.Path)
+		}
+
+		if req.Method != "GET" {
+			t.Error("request method should be GET but: ", req.Method)
+		}
+		respJSON, _ := json.Marshal(&Org{Name: "hoge"})
+
+		res.Header()["Content-Type"] = []string{"application/json"}
+		fmt.Fprint(res, string(respJSON))
+	}))
+	defer ts.Close()
+
+	client, _ := NewClientWithOptions("dummy-key", ts.URL, false)
+	org, err := client.GetOrg()
+	if err != nil {
+		t.Error("err should be nil but: ", err)
+	}
+
+	if org.Name != "hoge" {
+		t.Error("request sends json including Name but: ", org)
+	}
+
+	if org.DisplayName != "" {
+		t.Error("request sends json not including DisplayName but: ", org)
+	}
+}
+
+func TestGetOrgWithDisplayName(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
 		if req.URL.Path != "/api/v0/org" {
 			t.Error("request URL should be /api/v0/org but: ", req.URL.Path)