diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 7f30defcb1..81801f3dff 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8815,6 +8815,7 @@ static int do_getdents64(abi_long dirfd, abi_long arg2, abi_long count)
 #define     RISCV_HWPROBE_EXT_ZBA      (1 << 3)
 #define     RISCV_HWPROBE_EXT_ZBB      (1 << 4)
 #define     RISCV_HWPROBE_EXT_ZBS      (1 << 5)
+#define     RISCV_HWPROBE_EXT_ZICBOZ   (1 << 6)
 
 #define RISCV_HWPROBE_KEY_CPUPERF_0     5
 #define     RISCV_HWPROBE_MISALIGNED_UNKNOWN     (0 << 0)
@@ -8873,6 +8874,8 @@ static void risc_hwprobe_fill_pairs(CPURISCVState *env,
                      RISCV_HWPROBE_EXT_ZBB : 0;
             value |= cfg->ext_zbs ?
                      RISCV_HWPROBE_EXT_ZBS : 0;
+            value |= cfg->ext_zicboz ?
+                     RISCV_HWPROBE_EXT_ZICBOZ : 0;
             __put_user(value, &pair->value);
             break;
         case RISCV_HWPROBE_KEY_CPUPERF_0: