diff --git a/include/libfdt.h b/include/libfdt.h
index ce374fd..d23d40e 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -156,7 +156,7 @@
 #define __fdt_set_hdr(name) \
 	static inline void fdt_set_##name(void *fdt, uint32_t val) \
 	{ \
-		struct fdt_header *fdth = fdt; \
+		struct fdt_header *fdth = (struct fdt_header*)fdt; \
 		fdth->name = cpu_to_fdt32(val); \
 	}
 __fdt_set_hdr(magic);