diff --git a/contrib/elftoolchain/elfdump/elfdump.c b/contrib/elftoolchain/elfdump/elfdump.c
index 02a1fa176f35..36a8dfd41d77 100644
--- a/contrib/elftoolchain/elfdump/elfdump.c
+++ b/contrib/elftoolchain/elfdump/elfdump.c
@@ -56,6 +56,9 @@ ELFTC_VCSID("$Id: elfdump.c 3474 2016-05-17 20:44:53Z emaste $");
 #ifndef EM_IAMCU
 #define EM_IAMCU 6
 #endif
+#ifndef EM_RISCV
+#define EM_RISCV 243
+#endif
 
 #if defined(ELFTC_NEED_ELF_NOTE_DEFINITION)
 #include "native-elf-format.h"
diff --git a/contrib/elftoolchain/libelftc/elftc_reloc_type_str.c b/contrib/elftoolchain/libelftc/elftc_reloc_type_str.c
index eaae9827005c..1e977a7dd5e6 100644
--- a/contrib/elftoolchain/libelftc/elftc_reloc_type_str.c
+++ b/contrib/elftoolchain/libelftc/elftc_reloc_type_str.c
@@ -35,6 +35,9 @@
 #ifndef EM_IAMCU
 #define EM_IAMCU 6
 #endif
+#ifndef EM_RISCV
+#define EM_RISCV 243
+#endif
 
 const char *
 elftc_reloc_type_str(unsigned int mach, unsigned int type)
diff --git a/contrib/elftoolchain/readelf/readelf.c b/contrib/elftoolchain/readelf/readelf.c
index 5bb028f6d112..ba59275298cf 100644
--- a/contrib/elftoolchain/readelf/readelf.c
+++ b/contrib/elftoolchain/readelf/readelf.c
@@ -53,6 +53,9 @@ ELFTC_VCSID("$Id: readelf.c 3469 2016-05-15 23:16:09Z emaste $");
 #ifndef EM_IAMCU
 #define EM_IAMCU 6
 #endif
+#ifndef EM_RISCV
+#define EM_RISCV 243
+#endif
 #ifndef	STB_GNU_UNIQUE
 #define	STB_GNU_UNIQUE 10
 #endif