diff --git a/grub-core/kern/file.c b/grub-core/kern/file.c
index 8d48fd50d..750177248 100644
--- a/grub-core/kern/file.c
+++ b/grub-core/kern/file.c
@@ -66,6 +66,9 @@ grub_file_open (const char *name, enum grub_file_type type)
   const char *file_name;
   grub_file_filter_id_t filter;
 
+  /* Reset grub_errno before we start. */
+  grub_errno = GRUB_ERR_NONE;
+
   device_name = grub_file_get_device_name (name);
   if (grub_errno)
     goto fail;