diff --git a/sys/sys/efi_map.h b/sys/sys/efi_map.h
index 4edabd4e5812..8b458cd08b00 100644
--- a/sys/sys/efi_map.h
+++ b/sys/sys/efi_map.h
@@ -1,22 +1,24 @@
 /*
  * Copyright (c) 2014 The FreeBSD Foundation
  * Copyright (c) 2018 Andrew Turner
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 #ifndef _SYS_EFI_MAP_H_
 #define _SYS_EFI_MAP_H_
 
 #include <sys/efi.h>
 #include <machine/metadata.h>
 
+struct efi_map_header;
+
 typedef void (*efi_map_entry_cb)(struct efi_md *, void *argp);
 
 void efi_map_foreach_entry(struct efi_map_header *efihdr, efi_map_entry_cb cb,
     void *argp);
 
 void efi_map_add_entries(struct efi_map_header *efihdr);
 void efi_map_exclude_entries(struct efi_map_header *efihdr);
 void efi_map_print_entries(struct efi_map_header *efihdr);
 
 #endif /* !_SYS_EFI_MAP_H_ */