1 files changed, 1 insertions, 1 deletions
diff --git a/diff.c b/diff.c
index 8647db3d30..88aaed7d49 100644
--- a/diff.c
+++ b/diff.c
@@ -3227,7 +3227,7 @@ static void emit_binary_diff_body(struct diff_options *o,
 	}
 
 	if (delta && delta_size < deflate_size) {
-		char *s = xstrfmt("%lu", orig_size);
+		char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
 		emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
 				 s, strlen(s), 0);
 		free(s);