1 files changed, 1 insertions, 0 deletions
diff --git a/ref-filter.c b/ref-filter.c
index 4db0e40..f45d3a1 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -213,6 +213,7 @@ static int used_atom_cnt, need_tagged, need_symref;
  * Expand string, append it to strbuf *sb, then return error code ret.
  * Allow to save few lines of code.
  */
+__attribute__((format (printf, 3, 4)))
 static int strbuf_addf_ret(struct strbuf *sb, int ret, const char *fmt, ...)
 {
 	va_list ap;