diff --git a/disas/riscv.c b/disas/riscv.c
index e61bda5674..d597161d46 100644
--- a/disas/riscv.c
+++ b/disas/riscv.c
@@ -962,6 +962,8 @@ typedef enum {
     rv_op_cm_mvsa01 = 786,
     rv_op_cm_jt = 787,
     rv_op_cm_jalt = 788,
+    rv_op_czero_eqz = 789,
+    rv_op_czero_nez = 790,
 } rv_op;
 
 /* structures */
@@ -2119,6 +2121,8 @@ const rv_opcode_data opcode_data[] = {
     { "cm.mvsa01", rv_codec_zcmp_cm_mv, rv_fmt_rd_rs2, NULL, 0, 0, 0 },
     { "cm.jt", rv_codec_zcmt_jt, rv_fmt_zcmt_index, NULL, 0 },
     { "cm.jalt", rv_codec_zcmt_jt, rv_fmt_zcmt_index, NULL, 0 },
+    { "czero.eqz", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
+    { "czero.nez", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
 };
 
 /* CSR names */
@@ -2914,6 +2918,8 @@ static void decode_inst_opcode(rv_decode *dec, rv_isa isa)
             case 45: op = rv_op_minu; break;
             case 46: op = rv_op_max; break;
             case 47: op = rv_op_maxu; break;
+            case 075: op = rv_op_czero_eqz; break;
+            case 077: op = rv_op_czero_nez; break;
             case 130: op = rv_op_sh1add; break;
             case 132: op = rv_op_sh2add; break;
             case 134: op = rv_op_sh3add; break;