diff --git a/elf/elf.h b/elf/elf.h
index 02a1b3f52f..8d1c7fe7e6 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -506,6 +506,7 @@ typedef struct
 
 /* Legal values for ch_type (compression algorithm).  */
 #define ELFCOMPRESS_ZLIB	1	   /* ZLIB/DEFLATE algorithm.  */
+#define ELFCOMPRESS_ZSTD	2	   /* Zstandard algorithm.  */
 #define ELFCOMPRESS_LOOS	0x60000000 /* Start of OS-specific.  */
 #define ELFCOMPRESS_HIOS	0x6fffffff /* End of OS-specific.  */
 #define ELFCOMPRESS_LOPROC	0x70000000 /* Start of processor-specific.  */