diff --git a/libc/kernel/uapi/linux/elf-em.h b/libc/kernel/uapi/linux/elf-em.h
index b7c89da..5b54e18 100644
--- a/libc/kernel/uapi/linux/elf-em.h
+++ b/libc/kernel/uapi/linux/elf-em.h
@@ -52,6 +52,7 @@
 #define EM_TILEPRO 188
 #define EM_MICROBLAZE 189
 #define EM_TILEGX 191
+#define EM_RISCV 243
 #define EM_BPF 247
 #define EM_FRV 0x5441
 #define EM_ALPHA 0x9026