1 files changed, 1 insertions, 0 deletions
diff --git a/strbuf.h b/strbuf.h
index 223ee2094a..f1e9821a54 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -263,6 +263,7 @@ static inline void strbuf_insertstr(struct strbuf *sb, size_t pos,
 void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt,
 		     va_list ap);
 
+__attribute__((format (printf, 3, 4)))
 void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...);
 
 /**