diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index b4b4cbb..325972f 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,7 @@
+2018-02-22  Shea Levy <shea@shealevy.com>
+
+	* disassemble.c (ARCH_riscv): Define if ARCH_all.
+
 2018-02-22  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* i386-opc.tbl: Add {rex},
diff --git a/opcodes/disassemble.c b/opcodes/disassemble.c
index ae48f536..78f0995 100644
--- a/opcodes/disassemble.c
+++ b/opcodes/disassemble.c
@@ -76,6 +76,7 @@
 #define ARCH_pj
 #define ARCH_powerpc
 #define ARCH_pru
+#define ARCH_riscv
 #define ARCH_rs6000
 #define ARCH_rl78
 #define ARCH_rx