diff --git a/Gruntfile.js b/Gruntfile.js
index 2d9fc50c14d7a08fd19a617e652489b409d469b8..44236b491452a84014daa0284da47c566939fa71 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,4 +1,5 @@
 const loadGruntTasks = require("load-grunt-tasks");
+const { sep } = require("path");
 
 module.exports = grunt => {
   const BUILD_DIR = "build/";
@@ -46,7 +47,7 @@ module.exports = grunt => {
         }
       },
       buildRevealJs: {
-        command: "node_modules/.bin/grunt css jshint",
+        command: `sh node_modules${sep}.bin${sep}grunt css jshint`,
         options: {
           cwd: BUILD_DIR
         }