diff --git a/Senna/Frontend/DefaultLogger.swift b/Senna/Frontend/DefaultLogger.swift
index c09dd7c..0a5278e 100644
--- a/Senna/Frontend/DefaultLogger.swift
+++ b/Senna/Frontend/DefaultLogger.swift
@@ -6,7 +6,7 @@
 import Foundation
 
 public func log(flag: LogFlag, message: CustomStringConvertible?, filename: String = #file, function: String = #function, line: Int = #line) {
-    let allMessage = AllMessage(message, filename, function, line).cString(using: .utf8)
+    let allMessage = __messageConvert(message, filename, function, line).cString(using: .utf8)
     senna_default_logger_log(flag.rawValue, allMessage)
 }
 
diff --git a/Senna/Frontend/Logger.swift b/Senna/Frontend/Logger.swift
index fc89f31..c284066 100644
--- a/Senna/Frontend/Logger.swift
+++ b/Senna/Frontend/Logger.swift
@@ -68,7 +68,7 @@ extension Logger {
 // MARK: - Log
 extension Logger {
     public func log(flag: LogFlag, message: CustomStringConvertible?, filename: String = #file, function: String = #function, line: Int = #line) {
-        let allMessage = AllMessage(message, filename, function, line).cString(using: .utf8)
+        let allMessage = __messageConvert(message, filename, function, line).cString(using: .utf8)
         let loggerName = self.name.cString(using: .utf8)
         let flag = UInt32(flag.rawValue)
         senna_log_action(loggerName, flag, allMessage)
diff --git a/Senna/Frontend/Senna.swift b/Senna/Frontend/Senna.swift
index 81056fa..42669a1 100644
--- a/Senna/Frontend/Senna.swift
+++ b/Senna/Frontend/Senna.swift
@@ -33,7 +33,13 @@ public func drop(logger: Logger) {
     senna_drop_logger(loggerName)
 }
 
-let AllMessage: (CustomStringConvertible?, String, String, Int) -> String = { message, filename, function, line in
+public typealias MessageConvert = (_ message: CustomStringConvertible?, _ filename: String, _ function: String, _ line: Int) -> String
+
+public func register(messageConvert: @escaping MessageConvert) {
+    __messageConvert = messageConvert
+}
+
+var __messageConvert: MessageConvert = { message, filename, function, line in
     let allMessage = "[\(URL(fileURLWithPath: filename).lastPathComponent):\(line)] \(function) - \(message?.description ?? "")"
     return allMessage
 }