diff --git a/disasm/disasm.cc b/disasm/disasm.cc
index 2fbc1fbe..b627636d 100644
--- a/disasm/disasm.cc
+++ b/disasm/disasm.cc
@@ -2101,7 +2101,7 @@ disassembler_t::disassembler_t(const isa_parser_t *isa)
 
   // next-highest priority: other instructions in same base ISA
   std::string fallback_isa_string = std::string("rv") + std::to_string(isa->get_max_xlen()) +
-    "gqchv_zfh_zba_zbb_zbc_zbs_zkn_zkr_zks_svinval_xbitmanip";
+    "gqchv_zfh_zba_zbb_zbc_zbs_zicbom_zicboz_zkn_zkr_zks_svinval_xbitmanip";
   isa_parser_t fallback_isa(fallback_isa_string.c_str(), DEFAULT_PRIV);
   add_instructions(&fallback_isa);