diff --git a/apps/plugins/test_disk.c b/apps/plugins/test_disk.c
index b689ba672e..1429668556 100644
--- a/apps/plugins/test_disk.c
+++ b/apps/plugins/test_disk.c
@@ -156,7 +156,7 @@ static bool test_fs(void)
     fd = rb->open(TEST_FILE, O_RDONLY);
     if (fd < 0)
     {
-        rb->splashf(0, "open() failed: %d", ret);
+        rb->splashf(0, "open() failed: %d", fd);
         goto error;
     }