1 files changed, 2 insertions, 0 deletions

diff --git a/tail.c b/tail.c
index 5e05fe8e7..315eee188 100644
--- a/tail.c
+++ b/tail.c
@@ -445,6 +445,8 @@ extern int tail_main(int argc, char **argv)
 
 
 static void detailed_error(int i, int errnum, char *fmt, ...)
+                          __attribute__ ((format (printf, 3, 4)));
+static void detailed_error(int i, int errnum, char *fmt, ...)
 {
         va_list arguments;