diff --git a/cache.h b/cache.h
index ba04ff8..f9aed2d 100644
--- a/cache.h
+++ b/cache.h
@@ -1385,6 +1385,7 @@
 };
 
 int repo_get_oid(struct repository *r, const char *str, struct object_id *oid);
+__attribute__((format (printf, 2, 3)))
 int get_oidf(struct object_id *oid, const char *fmt, ...);
 int repo_get_oid_commit(struct repository *r, const char *str, struct object_id *oid);
 int repo_get_oid_committish(struct repository *r, const char *str, struct object_id *oid);
diff --git a/quote.h b/quote.h
index 768cc63..049d8dd 100644
--- a/quote.h
+++ b/quote.h
@@ -31,6 +31,7 @@
 
 void sq_quote_buf(struct strbuf *, const char *src);
 void sq_quote_argv(struct strbuf *, const char **argv);
+__attribute__((format (printf, 2, 3)))
 void sq_quotef(struct strbuf *, const char *fmt, ...);
 
 /*
diff --git a/strbuf.h b/strbuf.h
index 223ee20..f1e9821 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -263,6 +263,7 @@
 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, ...);
 
 /**