diff --git a/src/tools/runk/src/commands/kill.rs b/src/tools/runk/src/commands/kill.rs
index 0ae0d343dd..4526749da5 100644
--- a/src/tools/runk/src/commands/kill.rs
+++ b/src/tools/runk/src/commands/kill.rs
@@ -3,9 +3,9 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-use crate::Kill;
 use anyhow::Result;
 use libcontainer::container::Container;
+use liboci_cli::Kill;
 use nix::sys::signal::Signal;
 use slog::{info, Logger};
 use std::{convert::TryFrom, path::Path, str::FromStr};
@@ -15,9 +15,6 @@ pub fn run(opts: Kill, state_root: &Path, logger: &Logger) -> Result<()> {
     let container = Container::load(state_root, container_id)?;
     let sig = parse_signal(&opts.signal)?;
 
-    // TODO: liboci-cli does not support --all option for kill command.
-    // After liboci-cli supports the option, we will change the following code.
-    // as a workaround we use a custom Kill command.
     let all = opts.all;
     container.kill(sig, all)?;
 
diff --git a/src/tools/runk/src/main.rs b/src/tools/runk/src/main.rs
index 6b282ed0b4..c79746678e 100644
--- a/src/tools/runk/src/main.rs
+++ b/src/tools/runk/src/main.rs
@@ -6,7 +6,7 @@
 use anyhow::{anyhow, Result};
 use clap::{crate_description, crate_name, Parser};
 use liboci_cli::{CommonCmd, GlobalOpts};
-use liboci_cli::{Create, Delete, Start, State};
+use liboci_cli::{Create, Delete, Kill, Start, State};
 use slog::{o, Logger};
 use slog_async::AsyncGuard;
 use std::{
@@ -26,39 +26,20 @@ enum SubCommand {
     Standard(StandardCmd),
     #[clap(flatten)]
     Common(CommonCmd),
-    #[clap(flatten)]
-    Custom(CustomCmd),
     /// Launch an init process (do not call it outside of runk)
     Init {},
 }
 
 // Copy from https://github.com/containers/youki/blob/v0.0.3/crates/liboci-cli/src/lib.rs#L38-L44
-// but without Kill command.
 #[derive(Parser, Debug)]
 pub enum StandardCmd {
     Create(Create),
     Start(Start),
     State(State),
     Delete(Delete),
-}
-
-// as a workaround to support --all option for kill command,
-// we use a custom implementation of Kill.
-#[derive(Parser, Debug)]
-pub enum CustomCmd {
     Kill(Kill),
 }
 
-/// Send the specified signal to the container
-#[derive(Parser, Debug)]
-pub struct Kill {
-    #[clap(forbid_empty_values = true, required = true)]
-    pub container_id: String,
-    pub signal: String,
-    #[clap(short, long)]
-    pub all: bool,
-}
-
 #[derive(Parser, Debug)]
 #[clap(version, author, about = crate_description!())]
 struct Cli {
@@ -75,6 +56,7 @@ async fn cmd_run(subcmd: SubCommand, root_path: &Path, logger: &Logger) -> Resul
             StandardCmd::Start(start) => commands::start::run(start, root_path, logger).await,
             StandardCmd::Delete(delete) => commands::delete::run(delete, root_path, logger).await,
             StandardCmd::State(state) => commands::state::run(state, root_path, logger),
+            StandardCmd::Kill(kill) => commands::kill::run(kill, root_path, logger),
         },
         SubCommand::Common(cmd) => match cmd {
             CommonCmd::Run(run) => commands::run::run(run, root_path, logger).await,
@@ -88,9 +70,6 @@ async fn cmd_run(subcmd: SubCommand, root_path: &Path, logger: &Logger) -> Resul
                 return Err(anyhow!("command is not implemented yet"));
             }
         },
-        SubCommand::Custom(cmd) => match cmd {
-            CustomCmd::Kill(kill) => commands::kill::run(kill, root_path, logger),
-        },
         _ => unreachable!(),
     }
 }