diff --git a/Gruntfile.js b/Gruntfile.js
index 4c4840129f..87ad44044d 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -260,7 +260,14 @@ var path           = require('path'),
                     command: 'bourbon install --path <%= paths.adminAssets %>/sass/modules/'
                 },
                 coverage: {
-                    command: './node_modules/mocha/bin/mocha --timeout 15000 --reporter html-cov > coverage.html ./core/test/blanket_coverage.js'
+                    command: function () {
+                        // will work on windows only if mocha is globally installed
+                        var cmd = !!process.platform.match(/^win/) ? 'mocha' : './node_modules/mocha/bin/mocha';
+                        return cmd + ' --timeout 15000 --reporter html-cov > coverage.html ./core/test/blanket_coverage.js';
+                    },
+                    execOptions: {
+                        env: 'NODE_ENV=' + process.env.NODE_ENV
+                    }
                 }
             },
 
diff --git a/core/test/blanket_coverage.js b/core/test/blanket_coverage.js
index deabd107a6..c729acfed7 100644
--- a/core/test/blanket_coverage.js
+++ b/core/test/blanket_coverage.js
@@ -1,7 +1,7 @@
 var blanket = require("blanket")({
     "pattern": ["/core/server/", "/core/client/", "/core/shared/"],
     "data-cover-only": ["/core/server/", "/core/client/", "/core/shared/"]
-    }),
+}),
     requireDir = require("require-dir");
 
 requireDir("./unit");