diff --git a/include/libfdt.h b/include/libfdt.h
index 7ba13e6..dbc56ec 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -1 +1,14 @@
+#ifndef UBOOT_LIBFDT_H
+#define UBOOT_LIBFDT_H
+/*
+ * SPDX-License-Identifier:     GPL-2.0+ BSD-2-Clause
+ */
+
 #include "../lib/libfdt/libfdt.h"
+
+extern struct fdt_header *working_fdt;	/* Pointer to the working fdt */
+
+/* adding a ramdisk needs 0x44 bytes in version 2008.10 */
+#define FDT_RAMDISK_OVERHEAD	0x80
+
+#endif /* UBOOT_LIBFDT_H */
diff --git a/include/libfdt_env.h b/include/libfdt_env.h
index 273b5d3..ea26979 100644
--- a/include/libfdt_env.h
+++ b/include/libfdt_env.h
@@ -12,8 +12,6 @@
 #include "compiler.h"
 #include "linux/types.h"
 
-extern struct fdt_header *working_fdt;  /* Pointer to the working fdt */
-
 typedef __be16 fdt16_t;
 typedef __be32 fdt32_t;
 typedef __be64 fdt64_t;
@@ -23,7 +21,4 @@
 #define fdt64_to_cpu(x)		be64_to_cpu(x)
 #define cpu_to_fdt64(x)		cpu_to_be64(x)
 
-/* adding a ramdisk needs 0x44 bytes in version 2008.10 */
-#define FDT_RAMDISK_OVERHEAD	0x80
-
 #endif /* _LIBFDT_ENV_H */