diff --git a/log.c b/log.c
index 27dd6b42..87059351 100644
--- a/log.c
+++ b/log.c
@@ -63,8 +63,10 @@ _log(enum log_class log_class, const char *module, const char *file, int lineno,
 }
 
 static void
-_sys_log(enum log_class log_class, const char *module, const char *file,
-         int lineno, const char *fmt, int sys_errno, va_list va)
+_sys_log(enum log_class log_class, const char *module,
+         const char *file __attribute__((unused)),
+         int lineno __attribute__((unused)),
+         const char *fmt, int sys_errno, va_list va)
 {
     /* Map our log level to syslog's level */
     int level = -1;