1 files changed, 2 insertions, 0 deletions

diff --git a/include/stdio.h b/include/stdio.h
index 99f161867856..9d318fdf27e5 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -295,6 +295,8 @@ __END_DECLS
 __BEGIN_DECLS
 int	 asprintf __P((char **, const char *, ...)) __printflike(2, 3);
 char	*ctermid_r __P((char *));
+__const char *fmtcheck __P((const char *, const char *))
+	__attribute__((__format_arg__(2)));
 char	*fgetln __P((FILE *, size_t *));
 int	 fpurge __P((FILE *));
 int	 fseeko __P((FILE *, _BSD_OFF_T_, int));