diff --git a/CHANGELOG.md b/CHANGELOG.md
index 015e877b8e3b..6ec1c71fe80d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Remove percentage values for `translate-z` utilities ([#13321](https://github.com/tailwindlabs/tailwindcss/pull/13321), [#13327](https://github.com/tailwindlabs/tailwindcss/pull/13327))
 - `@tailwind/vite` now generates unique CSS bundle hashes when the Tailwind-generated CSS changes ([#13218](https://github.com/tailwindlabs/tailwindcss/pull/13218))
 - Inherit letter spacing in form controls ([#13328](https://github.com/tailwindlabs/tailwindcss/pull/13328))
+- Ensure `build` command is executed when using `--output` instead of `-o` ([#13369](https://github.com/tailwindlabs/tailwindcss/pull/13369))
 
 ## [4.0.0-alpha.10] - 2024-03-19
 
diff --git a/packages/@tailwindcss-cli/src/index.ts b/packages/@tailwindcss-cli/src/index.ts
index 3622a858c438..511781759079 100644
--- a/packages/@tailwindcss-cli/src/index.ts
+++ b/packages/@tailwindcss-cli/src/index.ts
@@ -9,8 +9,11 @@ const sharedOptions = {
   '--help': { type: 'boolean', description: 'Display usage information', alias: '-h' },
 } satisfies Arg
 
-const shared = args(sharedOptions)
-const command = shared._[0]
+const flags = args({
+  ...build.options(),
+  ...sharedOptions,
+})
+const command = flags._[0]
 
 // Right now we don't support any sub-commands. Let's show the help message
 // instead.
@@ -33,7 +36,7 @@ if (command) {
 //
 //   - `tailwindcss -o output.css`  // should run the build command, not show the help message
 //   - `tailwindcss > output.css`   // should run the build command, not show the help message
-if ((process.stdout.isTTY && !process.argv.slice(2).includes('-o')) || shared['--help']) {
+if ((process.stdout.isTTY && !flags['--output']) || flags['--help']) {
   help({
     usage: ['tailwindcss [--input input.css] [--output output.css] [--watch] [options…]'],
     options: { ...build.options(), ...sharedOptions },
@@ -42,4 +45,4 @@ if ((process.stdout.isTTY && !process.argv.slice(2).includes('-o')) || shared['-
 }
 
 // Handle the build command
-build.handle(args(build.options()))
+build.handle(flags)