1 files changed, 2 insertions, 1 deletions
diff --git a/monitor.c b/monitor.c
index e602480ebb..377ab378c2 100644
--- a/monitor.c
+++ b/monitor.c
@@ -316,7 +316,8 @@ void monitor_print_filename(Monitor *mon, const char *filename)
     }
 }
 
-static int monitor_fprintf(FILE *stream, const char *fmt, ...)
+static int GCC_FMT_ATTR(2, 3) monitor_fprintf(FILE *stream,
+                                              const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);