diff --git a/codex-rs/core/src/zsh_exec_bridge/mod.rs b/codex-rs/core/src/zsh_exec_bridge/mod.rs
index 4b8b5e0133..0bcda83208 100644
--- a/codex-rs/core/src/zsh_exec_bridge/mod.rs
+++ b/codex-rs/core/src/zsh_exec_bridge/mod.rs
@@ -166,6 +166,10 @@ impl ZshExecBridge {
         })?;
 
         let mut cmd = tokio::process::Command::new(&command[0]);
+        #[cfg(unix)]
+        if let Some(arg0) = &req.arg0 {
+            cmd.arg0(arg0);
+        }
         if command.len() > 1 {
             cmd.args(&command[1..]);
         }