diff --git a/packages/scripts/config/webpack.config.js b/packages/scripts/config/webpack.config.js
index 1175eb016eaf7..b3b7e578459d9 100644
--- a/packages/scripts/config/webpack.config.js
+++ b/packages/scripts/config/webpack.config.js
@@ -227,7 +227,7 @@ const config = {
 	plugins: [
 		new DefinePlugin( {
 			// Inject the `SCRIPT_DEBUG` global, used for development features flagging.
-			SCRIPT_DEBUG: mode === 'development',
+			SCRIPT_DEBUG: ! isProduction,
 		} ),
 		// During rebuilds, all webpack assets that are not used anymore will be
 		// removed automatically. There is an exception added in watch mode for