diff --git a/types/rational.go b/types/rational.go
index 2276ab4f29..550c96825a 100644
--- a/types/rational.go
+++ b/types/rational.go
@@ -153,13 +153,6 @@ func (r Rat) ToLeftPadded(totalDigits int8) string {
 
 //___________________________________________________________________________________
 
-// Hack to just use json.Marshal for everything until
-// we update for amino
-//type JSONCodec struct{}
-//nolint
-//func (jc JSONCodec) MarshalJSON(o interface{}) ([]byte, error)    { return json.Marshal(o) }
-//func (jc JSONCodec) UnmarshalJSON(bz []byte, o interface{}) error { return json.Unmarshal(bz, o) }
-
 //Wraps r.MarshalText() in quotes to make it a valid JSON string.
 func (r Rat) MarshalJSON() ([]byte, error) {
 	bz, err := (&(r.Rat)).MarshalText()
diff --git a/types/rational_test.go b/types/rational_test.go
index 2625db0640..39207034cb 100644
--- a/types/rational_test.go
+++ b/types/rational_test.go
@@ -209,15 +209,17 @@ func TestToLeftPadded(t *testing.T) {
 	}
 }
 
+var cdc = wire.NewCodec() //var jsonCdc JSONCodec // TODO wire.Codec
+
 func TestZeroSerializationJSON(t *testing.T) {
 	r := NewRat(0, 1)
-	err := r.UnmarshalJSON([]byte(`"0/1"`))
+	err := cdc.UnmarshalJSON([]byte(`"0/1"`), &r)
 	assert.Nil(t, err)
-	err = r.UnmarshalJSON([]byte(`"0/0"`))
+	err = cdc.UnmarshalJSON([]byte(`"0/0"`), &r)
 	assert.NotNil(t, err)
-	err = r.UnmarshalJSON([]byte(`"1/0"`))
+	err = cdc.UnmarshalJSON([]byte(`"1/0"`), &r)
 	assert.NotNil(t, err)
-	err = r.UnmarshalJSON([]byte(`"{}"`))
+	err = cdc.UnmarshalJSON([]byte(`"{}"`), &r)
 	assert.NotNil(t, err)
 }
 
@@ -233,8 +235,6 @@ func TestSerializationText(t *testing.T) {
 	assert.True(t, r.Equal(r2), "original: %v, unmarshalled: %v", r, r2)
 }
 
-var cdc = wire.NewCodec() //var jsonCdc JSONCodec // TODO wire.Codec
-
 func TestSerializationGoWire(t *testing.T) {
 	r := NewRat(1, 3)
 	bz, err := cdc.MarshalJSON(r)