diff --git a/src/framework/core/logger.h b/src/framework/core/logger.h
index 7c088eaf..1be7b0ad 100644
--- a/src/framework/core/logger.h
+++ b/src/framework/core/logger.h
@@ -39,7 +39,7 @@ class Logger
         MAX_LOG_HISTORY = 1000
     };
 
-    typedef std::function<void(Fw::LogLevel, std::string, std::size_t)> OnLogCallback;
+    typedef std::function<void(Fw::LogLevel, const std::string&, int)> OnLogCallback;
 
 public:
     void log(Fw::LogLevel level, const std::string& message);