diff --git a/json.go b/json.go
index 9f038fa..8422e6e 100644
--- a/json.go
+++ b/json.go
@@ -1,20 +1,8 @@
-//go:build jsoniter
-
 package log
 
-import (
-	jsoniter "github.com/json-iterator/go"
-)
+import "encoding/json"
 
 type (
-	Marshaler  = jsoniter.Marshaler
-	RawMessage = jsoniter.RawMessage
+	Marshaler  = json.Marshaler
+	RawMessage = json.RawMessage
 )
-
-func Marshal(v any) ([]byte, error) {
-	return jsoniter.ConfigFastest.Marshal(v)
-}
-
-func MarshalIndent(v any, prefix, indent string) ([]byte, error) {
-	return jsoniter.ConfigFastest.MarshalIndent(v, prefix, indent)
-}
diff --git a/json_iter.go b/json_iter.go
new file mode 100644
index 0000000..88c2b89
--- /dev/null
+++ b/json_iter.go
@@ -0,0 +1,15 @@
+//go:build jsoniter
+
+package log
+
+import (
+	jsoniter "github.com/json-iterator/go"
+)
+
+func Marshal(v any) ([]byte, error) {
+	return jsoniter.ConfigFastest.Marshal(v)
+}
+
+func MarshalIndent(v any, prefix, indent string) ([]byte, error) {
+	return jsoniter.ConfigFastest.MarshalIndent(v, prefix, indent)
+}
diff --git a/json_std.go b/json_std.go
index 9fb6890..fa5cbc9 100644
--- a/json_std.go
+++ b/json_std.go
@@ -4,11 +4,6 @@ package log
 
 import "encoding/json"
 
-type (
-	Marshaler  = json.Marshaler
-	RawMessage = json.RawMessage
-)
-
 func Marshal(v any) ([]byte, error) {
 	return json.Marshal(v)
 }