diff --git a/.changeset/fair-ants-deny.md b/.changeset/fair-ants-deny.md
new file mode 100644
index 000000000..de9402ebd
--- /dev/null
+++ b/.changeset/fair-ants-deny.md
@@ -0,0 +1,5 @@
+---
+'preact-cli': patch
+---
+
+No longer copies 'sw-debug.js' to output directory on prod builds. No functional changes, as it was not used.
diff --git a/packages/cli/lib/lib/webpack/webpack-client-config.js b/packages/cli/lib/lib/webpack/webpack-client-config.js
index 2add797cf..a390d3bf7 100644
--- a/packages/cli/lib/lib/webpack/webpack-client-config.js
+++ b/packages/cli/lib/lib/webpack/webpack-client-config.js
@@ -92,7 +92,7 @@ async function clientConfig(env) {
 					// copy any static files
 					existsSync(source('assets')) && { from: 'assets', to: 'assets' },
 					// copy sw-debug
-					{
+					!isProd && {
 						from: resolve(__dirname, '../../resources/sw-debug.js'),
 						to: 'sw-debug.js',
 					},
diff --git a/packages/cli/tests/images/build.js b/packages/cli/tests/images/build.js
index 0d6f311f7..afd1fcb91 100644
--- a/packages/cli/tests/images/build.js
+++ b/packages/cli/tests/images/build.js
@@ -30,7 +30,6 @@ exports.default = exports.full = Object.assign({}, common, {
 	'ssr-build/ssr-bundle.6e806.css.map': 1250,
 	'ssr-build/ssr-bundle.js': 9976,
 	'ssr-build/ssr-bundle.js.map': 30887,
-	'sw-debug.js': 775,
 });
 exports['default-esm'] = exports.full = Object.assign({}, exports.default, {
 	'bundle.*.esm.js': 21135,