diff --git a/skeleton/cli-bundler/aurelia_project/tasks/process-css.ext b/skeleton/cli-bundler/aurelia_project/tasks/process-css.ext
index c07276295..191519c19 100644
--- a/skeleton/cli-bundler/aurelia_project/tasks/process-css.ext
+++ b/skeleton/cli-bundler/aurelia_project/tasks/process-css.ext
@@ -51,7 +51,7 @@ import * as postcssUrl from 'postcss-url';
 // @endif
 
 export default function processCSS() {
-  return gulp.src(project.cssProcessor.source, {sourcemaps: true, since: gulp.lastRun(processCSS)})
+  return gulp.src(project.cssProcessor.source, {sourcemaps: true/* @if !feat.less && !feat.sass && !feat.stylus */, since: gulp.lastRun(processCSS)/* @endif */})
     // @if feat.less || feat.stylus
     .pipe(plumber({ errorHandler: notify.onError('Error: <%= error.message %>') }))
     // @endif