diff --git a/snowflake.go b/snowflake.go
index 21cc5e8..26da1fe 100644
--- a/snowflake.go
+++ b/snowflake.go
@@ -127,7 +127,8 @@ func (f ID) Step() int64 {
 
 // MarshalJSON returns a json byte array string of the snowflake ID.
 func (f ID) MarshalJSON() ([]byte, error) {
-	buff := []byte("\"")
+	buff := make([]byte, 0, 22)
+	buff = append(buff, '"')
 	buff = strconv.AppendInt(buff, int64(f), 10)
 	buff = append(buff, '"')
 	return buff, nil
diff --git a/snowflake_test.go b/snowflake_test.go
index 93c459e..40c1a95 100644
--- a/snowflake_test.go
+++ b/snowflake_test.go
@@ -44,26 +44,26 @@ func BenchmarkGenerate(b *testing.B) {
 }
 
 func BenchmarkUnmarshal(b *testing.B) {
-
+	// Generate the ID to unmarshal
 	node, _ := NewNode(1)
 	id := node.Generate()
+	bytes, _ := id.MarshalJSON()
+
 	var id2 ID
 
 	b.ReportAllocs()
-
 	b.ResetTimer()
 	for n := 0; n < b.N; n++ {
-		_ = id2.UnmarshalJSON(id.Bytes())
+		_ = id2.UnmarshalJSON(bytes)
 	}
 }
 
 func BenchmarkMarshal(b *testing.B) {
-
+	// Generate the ID to marshal
 	node, _ := NewNode(1)
 	id := node.Generate()
 
 	b.ReportAllocs()
-
 	b.ResetTimer()
 	for n := 0; n < b.N; n++ {
 		_, _ = id.MarshalJSON()