diff --git a/src/zm_logger.cpp b/src/zm_logger.cpp
index f8e7d7316..dd03ec9f2 100644
--- a/src/zm_logger.cpp
+++ b/src/zm_logger.cpp
@@ -415,7 +415,7 @@ void Logger::closeSyslog() {
   (void) closelog();
 }
 
-void Logger::logPrint(bool hex, const char * const filepath, const int line, const int level, const char *fstring, ...) {
+void Logger::logPrint(bool hex, const char *filepath, int line, int level, const char *fstring, ...) {
   if (level > mEffectiveLevel) return;
   if (level < PANIC || level > DEBUG9)
     Panic("Invalid logger level %d", level);
diff --git a/src/zm_logger.h b/src/zm_logger.h
index b2a9bbeb0..79c3dfd7c 100644
--- a/src/zm_logger.h
+++ b/src/zm_logger.h
@@ -173,8 +173,13 @@ private:
   void closeSyslog();
   void closeDatabase();
 
-public:
-  void logPrint(bool hex, const char * const filepath, const int line, const int level, const char *fstring, ...);
+ public:
+  void logPrint(bool hex,
+                const char *filepath,
+                int line,
+                int level,
+                const char *fstring,
+                ...) __attribute__((format(printf, 6, 7)));
 };
 
 void logInit(const char *name, const Logger::Options &options=Logger::Options());