diff --git a/Gruntfile.coffee b/Gruntfile.coffee
index 4f194669b..cf84d26d4 100644
--- a/Gruntfile.coffee
+++ b/Gruntfile.coffee
@@ -198,10 +198,10 @@ module.exports = (grunt) ->
       update:
         command: """
           npm install --save-dev <%= Object.keys(pkg.devDependencies).filter(function(name) {return /^\\^/.test(pkg.devDependencies[name]);}).map(function(name) {return name+'@latest';}).join(' ') %>
-          ./node_modules/.bin/npm-shrinkwrap --dev
+          node_modules/.bin/npm-shrinkwrap --dev
         """.split('\n').join('&&').replace(/\//g, path.sep)
       shrinkwrap:
-        command: './node_modules/.bin/npm-shrinkwrap --dev'
+        command: 'node_modules/.bin/npm-shrinkwrap --dev'.replace(/\//g, path.sep)
 
     watch:
       options: