diff --git a/binding/binding_test.go b/binding/binding_test.go
index 6710e42b..73019207 100644
--- a/binding/binding_test.go
+++ b/binding/binding_test.go
@@ -645,9 +645,9 @@ func TestValidationDisabled(t *testing.T) {
 	assert.NoError(t, err)
 }
 
-func TestExistsSucceeds(t *testing.T) {
+func TestRequiredSucceeds(t *testing.T) {
 	type HogeStruct struct {
-		Hoge *int `json:"hoge" binding:"exists"`
+		Hoge *int `json:"hoge" binding:"required"`
 	}
 
 	var obj HogeStruct
@@ -656,9 +656,9 @@ func TestExistsSucceeds(t *testing.T) {
 	assert.NoError(t, err)
 }
 
-func TestExistsFails(t *testing.T) {
+func TestRequiredFails(t *testing.T) {
 	type HogeStruct struct {
-		Hoge *int `json:"foo" binding:"exists"`
+		Hoge *int `json:"foo" binding:"required"`
 	}
 
 	var obj HogeStruct