diff --git a/README.md b/README.md
index 5accc82..37ab576 100644
--- a/README.md
+++ b/README.md
@@ -251,6 +251,7 @@ console.log(`Hello from ${$.blue.bold("worker")}!`);
 
 - **$.shell:** Set the shell that is used by `` $`command` ``. Default:
   `/bin/sh`
+- **$.prefix:** Command prefix. Default: `set -euo pipefail;`.
 - **$.mainModule:** The executed dzx script.
 - **$.verbose:** Enable debugging output (log shell commands and execution
   time).
diff --git a/src/runtime/exec.ts b/src/runtime/exec.ts
index fb36293..47ba5f5 100644
--- a/src/runtime/exec.ts
+++ b/src/runtime/exec.ts
@@ -19,7 +19,7 @@ export async function exec(
   const stderr: Array<string> = [];
   const combined: Array<string> = [];
   const process = Deno.run({
-    cmd: [$.shell, "-c", cmd],
+    cmd: [$.shell, "-c", $.prefix + " " + cmd],
     env: Deno.env.toObject(),
     stdout: $.stdout,
     stderr: $.stderr,
diff --git a/src/runtime/mod.ts b/src/runtime/mod.ts
index 1732c03..a936370 100644
--- a/src/runtime/mod.ts
+++ b/src/runtime/mod.ts
@@ -5,6 +5,7 @@ import { quote } from "./quote.ts";
 
 export type $ = typeof exec & typeof colors & {
   shell: string;
+  prefix: string;
   mainModule: string;
   verbose: boolean;
   stdout: NonNullable<Deno.RunOptions["stdout"]>;
@@ -22,6 +23,7 @@ Object.setPrototypeOf($, Object.getPrototypeOf(colors));
 
 $._stack = [];
 $.shell = "/bin/sh";
+$.prefix = "set -euo pipefail;";
 $.mainModule = "";
 $.verbose = false;
 $.stdout = "piped";