diff --git a/riscv/fdt.c b/riscv/fdt.c
index 4fe4583..c62d4a3 100644
--- a/riscv/fdt.c
+++ b/riscv/fdt.c
@@ -33,6 +33,7 @@
 	{"zbkx", KVM_RISCV_ISA_EXT_ZBKX},
 	{"zbs", KVM_RISCV_ISA_EXT_ZBS},
 	{"zca", KVM_RISCV_ISA_EXT_ZCA},
+	{"zcb", KVM_RISCV_ISA_EXT_ZCB},
 	{"zfa", KVM_RISCV_ISA_EXT_ZFA},
 	{"zfh", KVM_RISCV_ISA_EXT_ZFH},
 	{"zfhmin", KVM_RISCV_ISA_EXT_ZFHMIN},
diff --git a/riscv/include/kvm/kvm-config-arch.h b/riscv/include/kvm/kvm-config-arch.h
index 40679ef..68fc47c 100644
--- a/riscv/include/kvm/kvm-config-arch.h
+++ b/riscv/include/kvm/kvm-config-arch.h
@@ -76,6 +76,9 @@
 	OPT_BOOLEAN('\0', "disable-zca",				\
 		    &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZCA],	\
 		    "Disable Zca Extension"),				\
+	OPT_BOOLEAN('\0', "disable-zcb",				\
+		    &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZCB],	\
+		    "Disable Zcb Extension"),				\
 	OPT_BOOLEAN('\0', "disable-zfa",				\
 		    &(cfg)->ext_disabled[KVM_RISCV_ISA_EXT_ZFA],	\
 		    "Disable Zfa Extension"),				\