1 files changed, 1 insertions, 1 deletions

diff --git a/tools/usb/ffs-test.c b/tools/usb/ffs-test.c
index 4b107b5e623f..8674b9ec14f6 100644
--- a/tools/usb/ffs-test.c
+++ b/tools/usb/ffs-test.c
@@ -297,7 +297,7 @@ static void *start_thread_helper(void *arg)
 
                 ret = t->in(t, t->buf, t->buf_size);
                 if (ret > 0) {
-                        ret = t->out(t, t->buf, t->buf_size);
+                        ret = t->out(t, t->buf, ret);
                         name = out_name;
                         op = "write";
                 } else {