diff --git a/lib/command.c b/lib/command.c
index fb558b64d3..d90e33e42a 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -2346,7 +2346,7 @@ DEFUN (config_log_file,
 				    zlog_default->default_lvl);
 }
 
-static void disable_log_file()
+static void disable_log_file(void)
 {
 	zlog_reset_file();