diff --git a/Gruntfile.js b/Gruntfile.js
index 2ff1b92bf6d7f..ccb4c697954ac 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1219,6 +1219,14 @@ module.exports = function(grunt) {
 	] );
 
 	grunt.registerTask( 'sync-gutenberg-packages', function() {
+		if ( ! grunt.option( 'dev' ) ) {
+			console.log( 'You must manually pass the --dev flag to the sync-gutenberg-packages task as follows:' );
+			console.log( 'npx grunt sync-gutenberg-packages --dev' );
+			console.log( 'Otherwise the webpack build tasks are executed in the production mode and do not ');
+			console.log( 'regenerate the src/wp-includes/assets/script-loader-packages.php.' );
+			process.exit( 0 );
+		}
+
 		if ( grunt.option( 'update-browserlist' ) ) {
 			/*
 			 * Updating the browserlist database is opt-in and up to the release lead.
@@ -1248,7 +1256,7 @@ module.exports = function(grunt) {
 		grunt.task.run( 'wp-packages:refresh-deps' );
 
 		// Build the files stored in the src/ directory.
-		grunt.task.run( 'build:dev' );
+		grunt.task.run( 'build' );
 	} );
 
 	grunt.renameTask( 'watch', '_watch' );
diff --git a/package.json b/package.json
index 4ed33eac1a886..0c3a4715ae716 100644
--- a/package.json
+++ b/package.json
@@ -175,6 +175,6 @@
 		"test:php": "node ./tools/local-env/scripts/docker.js run -T php composer update -W && node ./tools/local-env/scripts/docker.js run php ./vendor/bin/phpunit",
 		"test:e2e": "node ./tests/e2e/run-tests.js",
 		"test:visual": "node ./tests/visual-regression/run-tests.js",
-		"sync-gutenberg-packages": "grunt sync-gutenberg-packages"
+		"sync-gutenberg-packages": "grunt sync-gutenberg-packages --dev"
 	}
 }