1 files changed, 1 insertions, 0 deletions
diff --git a/trace.c b/trace.c
index 5ec0e3b..3d744d1 100644
--- a/trace.c
+++ b/trace.c
@@ -75,6 +75,7 @@ static void trace_vprintf(const char *key, const char *fmt, va_list ap)
 	strbuf_release(&buf);
 }
 
+__attribute__((format (printf, 2, 3)))
 static void trace_printf_key(const char *key, const char *fmt, ...)
 {
 	va_list ap;