diff --git a/system/fastboot/fastboot.c b/system/fastboot/fastboot.c
index f216e07a5..1d29a9def 100644
--- a/system/fastboot/fastboot.c
+++ b/system/fastboot/fastboot.c
@@ -237,6 +237,7 @@ static void fastboot_flash_close(int fd)
 {
   if (fd >= 0)
     {
+      fsync(fd);
       close(fd);
     }
 }