diff --git a/handlebars/helpers/index.js b/handlebars/helpers/index.js
index bd0e6b8..59118f6 100644
--- a/handlebars/helpers/index.js
+++ b/handlebars/helpers/index.js
@@ -230,7 +230,7 @@ function renderTree(object, options) {
  * @memberOf helpers
  */
 function withPackageOf(filePath, options) {
-  return resolvePackageRoot(path.resolve(filePath)).then(function (resolvedPackageRoot) {
+  return resolvePackageRoot(path.resolve(filePath), { posix: true }).then(function (resolvedPackageRoot) {
     const data = Handlebars.createFrame(options.data)
     data.url = _githubUrl(resolvedPackageRoot)
     data.package = resolvedPackageRoot.packageJson
@@ -426,7 +426,7 @@ function transformTree(object, fn) {
  */
 function github(filePath) {
   // Build url to correct version and file in githubs
-  return resolvePackageRoot(path.resolve(filePath)).then(_githubUrl)
+  return resolvePackageRoot(path.resolve(filePath), { posix: true }).then(_githubUrl)
 }
 
 /**
diff --git a/lib/utils/resolve-package-root.js b/lib/utils/resolve-package-root.js
index 488d259..b07d2ee 100644
--- a/lib/utils/resolve-package-root.js
+++ b/lib/utils/resolve-package-root.js
@@ -12,15 +12,17 @@ module.exports = { resolvePackageRoot }
  * * **relativeFile**: The path of "file" relative to the packageRoot
  * * **packageJson**: The required package.json
  *
- * @param file
+ * @param
+ * @param {boolean} posix if set to true, use POSIX separator (i.e. "/") instead of OS dependent one.
  * @return {{packageRoot: string, packageJson: object, relativeFile: string}} the path to the package.json
  */
-function resolvePackageRoot(file) {
+function resolvePackageRoot(file, { posix = false } = {}) {
   try {
-    const fullPath = path.resolve(file)
-    for (let lead = fullPath; path.dirname(lead) !== lead; lead = path.dirname(lead)) {
+    const chosenPath = posix ? path.posix : path
+    const fullPath = chosenPath.resolve(file)
+    for (let lead = fullPath; chosenPath.dirname(lead) !== lead; lead = chosenPath.dirname(lead)) {
       debug('Looking for package.json in ' + lead)
-      const packagePath = path.join(lead, 'package.json')
+      const packagePath = chosenPath.join(lead, 'package.json')
       try {
         if (fs.statSync(packagePath).isFile()) {
           return fs
@@ -28,8 +30,8 @@ function resolvePackageRoot(file) {
             .then(JSON.parse)
             .then(packageJson => {
               return {
-                packageRoot: path.relative(process.cwd(), lead) || '.',
-                relativeFile: path.relative(lead, fullPath),
+                packageRoot: chosenPath.relative(process.cwd(), lead) || '.',
+                relativeFile: chosenPath.relative(lead, fullPath),
                 packageJson
               }
             })