diff --git a/lib/db.h b/lib/db.h
index 884c7377f2..c8ce7fe57d 100644
--- a/lib/db.h
+++ b/lib/db.h
@@ -36,21 +36,24 @@
 #define _FRR_DB_H_
 #ifdef HAVE_SQLITE3
 
+#include "compiler.h"
 #include <sqlite3.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-extern int db_init(const char *path_fmt, ...);
+extern int db_init(const char *path_fmt, ...) PRINTFRR(1, 2);
 extern int db_close(void);
+/* WARNING: sqlite format string! not printf compatible! */
 extern int db_bindf(struct sqlite3_stmt *ss, const char *fmt, ...);
 extern struct sqlite3_stmt *db_prepare_len(const char *stmt, int stmtlen);
 extern struct sqlite3_stmt *db_prepare(const char *stmt);
 extern int db_run(struct sqlite3_stmt *ss);
+/* WARNING: sqlite format string! not scanf compatible! */
 extern int db_loadf(struct sqlite3_stmt *ss, const char *fmt, ...);
 extern void db_finalize(struct sqlite3_stmt **ss);
-extern int db_execute(const char *stmt_fmt, ...);
+extern int db_execute(const char *stmt_fmt, ...) PRINTFRR(1, 2);
 
 #ifdef __cplusplus
 }
diff --git a/lib/zlog.h b/lib/zlog.h
index dcc0bf14e9..6316a2ad40 100644
--- a/lib/zlog.h
+++ b/lib/zlog.h
@@ -71,8 +71,8 @@ struct xrefdata_logmsg {
  * determine whether something is a log message or something else.
  */
 
-extern void vzlogx(const struct xref_logmsg *xref, int prio,
-		   const char *fmt, va_list ap);
+extern void vzlogx(const struct xref_logmsg *xref, int prio, const char *fmt,
+		   va_list ap) PRINTFRR(3, 0);
 #define vzlog(prio, ...) vzlogx(NULL, prio, __VA_ARGS__)
 
 PRINTFRR(2, 3)