1 files changed, 1 insertions, 0 deletions
diff --git a/midx.c b/midx.c
index 9a35b0255d..321c6fdd2f 100644
--- a/midx.c
+++ b/midx.c
@@ -1172,6 +1172,7 @@ void clear_midx_file(struct repository *r)
 
 static int verify_midx_error;
 
+__attribute__((format (printf, 1, 2)))
 static void midx_report(const char *fmt, ...)
 {
 	va_list ap;