diff --git a/headers/os/kernel/elf.h b/headers/os/kernel/elf.h
index 7468f28160..5155a2e206 100644
--- a/headers/os/kernel/elf.h
+++ b/headers/os/kernel/elf.h
@@ -76,6 +76,7 @@ typedef struct {
 } Elf64_Ehdr;
 
 #define ELFMAG		"\x7f""ELF"
+#define SELFMAG		4
 
 /* e_ident[] indices */
 #define EI_MAG0		0