diff --git a/lib/src/cli.rs b/lib/src/cli.rs
index 215feef06..0db4821b8 100644
--- a/lib/src/cli.rs
+++ b/lib/src/cli.rs
@@ -167,9 +167,10 @@ pub(crate) enum Opt {
     /// Execute the given command in the host mount namespace
     #[cfg(feature = "install")]
     #[clap(hide = true)]
-    #[command(external_subcommand)]
-    ExecInHostMountNamespace(Vec<OsString>),
-
+    ExecInHostMountNamespace {
+        #[clap(trailing_var_arg = true, allow_hyphen_values = true)]
+        args: Vec<OsString>,
+    },
     /// Internal integration testing helpers.
     #[clap(hide(true), subcommand)]
     #[cfg(feature = "internal-testing-api")]
@@ -468,7 +469,7 @@ async fn run_from_opt(opt: Opt) -> Result<()> {
             InstallOpts::ToFilesystem(opts) => crate::install::install_to_filesystem(opts).await,
         },
         #[cfg(feature = "install")]
-        Opt::ExecInHostMountNamespace(args) => {
+        Opt::ExecInHostMountNamespace { args } => {
             crate::install::exec_in_host_mountns(args.as_slice())
         }
         Opt::Status(opts) => super::status::status(opts).await,
diff --git a/lib/src/install.rs b/lib/src/install.rs
index f43a99043..cc483813f 100644
--- a/lib/src/install.rs
+++ b/lib/src/install.rs
@@ -673,7 +673,7 @@ pub(crate) fn run_in_host_mountns(cmd: &str) -> Command {
 
 #[context("Re-exec in host mountns")]
 pub(crate) fn exec_in_host_mountns(args: &[std::ffi::OsString]) -> Result<()> {
-    let (cmd, args) = args[1..]
+    let (cmd, args) = args
         .split_first()
         .ok_or_else(|| anyhow::anyhow!("Missing command"))?;
     tracing::trace!("{cmd:?} {args:?}");
@@ -694,6 +694,7 @@ fn skopeo_supports_containers_storage() -> Result<bool> {
     let o = run_in_host_mountns("skopeo").arg("--version").output()?;
     let st = o.status;
     if !st.success() {
+        let _ = std::io::copy(&mut std::io::Cursor::new(o.stderr), &mut std::io::stderr()); // Ignore errors copying stderr
         anyhow::bail!("Failed to run skopeo --version: {st:?}");
     }
     let stdout = String::from_utf8(o.stdout).context("Parsing skopeo version")?;