diff --git a/Makefile b/Makefile
index a207b77b6..74acbc411 100644
--- a/Makefile
+++ b/Makefile
@@ -62,7 +62,6 @@ bootstrap-common:
 bootstrap: bootstrap-common
 	$(NPM) link
 	NODE_PATH=$(NODE_PATH) $(BOWER) install --config.interactive=0
-	NODE_PATH=$(NODE_PATH) $(GRUNT) sed:bootstrap $(DEBUG) $(VERBOSE) --gruntfile=mockup/Gruntfile.js
 
 bootstrap-nix: clean bootstrap-common
 	nix-build default.nix -A build -o nixenv
diff --git a/mockup/Gruntfile.js b/mockup/Gruntfile.js
index 3f747b259..645fca93c 100644
--- a/mockup/Gruntfile.js
+++ b/mockup/Gruntfile.js
@@ -106,15 +106,7 @@ module.exports = function(grunt) {
     { path: 'build/', url: '++resource++plone.app.widgets' }
   );
 
-  mockup.initGrunt(grunt, {
-    sed: {
-      bootstrap: {
-        path: '../node_modules/lcov-result-merger/index.js',
-        pattern: "throw new Error\\('Unknown Prefix ",
-        replacement: "//throw// new Error('Unknown Prefix "
-      }
-    }
-  });
+  mockup.initGrunt(grunt, {});
 
   grunt.registerTask('i18n-dump', 'Dump i18n file for widgets', function() {
     var output =