diff --git a/grub-core/commands/efi/tpm.c b/grub-core/commands/efi/tpm.c
index a97d85368..e73bd5561 100644
--- a/grub-core/commands/efi/tpm.c
+++ b/grub-core/commands/efi/tpm.c
@@ -145,7 +145,8 @@ grub_efi_log_event_status (grub_efi_status_t status)
     case GRUB_EFI_NOT_FOUND:
       return grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("TPM unavailable"));
     default:
-      return grub_error (GRUB_ERR_UNKNOWN_DEVICE, N_("Unknown TPM error"));
+      grub_dprintf ("tpm", "Unknown TPM error: %" PRIdGRUB_SSIZE, status);
+      return 0;
     }
 }