diff --git a/.travis.yml b/.travis.yml
index 1a9705a..e372404 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ os:
   - windows
   - linux
 node_js:
-  - 'stable'
+  - 'node'
   - '10'
   - '8'
 cache:
diff --git a/lib/fix_html.js b/lib/fix_html.js
index 89ba555..90e0d58 100644
--- a/lib/fix_html.js
+++ b/lib/fix_html.js
@@ -2,9 +2,10 @@
 /* eslint-disable no-cond-assign */
 
 const slugify = require('slugify')
-const resolve = require('path').resolve
-const dirname = require('path').dirname
-const relative = require('path').relative
+const resolve = require('path').posix.resolve
+const dirname = require('path').posix.dirname
+const relative = require('path').posix.relative
+const normalizePath = require('./helpers/normalize_path')
 
 /**
  * Internal: Performs in-place HTML filters (such as fixing URLs).
@@ -33,7 +34,7 @@ function idify ($) {
  */
 
 function fixReferences ($, fname, sources, files, page) {
-  var base = page.source
+  var base = normalizePath(page.source)
   var m
 
   $('[href], [src]').each(function () {
@@ -57,11 +58,14 @@ function fixReferences ($, fname, sources, files, page) {
     }
 
     // Get the target source file it points to (eg, `docs/usage.md`).
-    var target = getTarget(origUrl, base)
+    debugger
+    var target = normalizePath(getTarget(origUrl, base))
 
     // Ensure that it's available.
     if (!sources[target]) {
-      throw new Error(`${base}: Unknown reference '${origUrl}'`)
+      debugger
+      console.log(sources)
+      throw new Error(`${base}: Unknown reference '${origUrl}' (target: ${target})`)
     }
 
     // Relativize that absolute URL.
@@ -81,6 +85,7 @@ function getTarget (url, base) {
   if (url.substr(0, 1) === '/') {
     return url.substr(1)
   } else {
-    return resolve('/' + dirname(base) + '/' + url).substr(1)
+    let resolved = resolve('/' + dirname(base) + '/' + url).substr(1)
+    return resolved
   }
 }
diff --git a/lib/helpers/normalize_path.js b/lib/helpers/normalize_path.js
new file mode 100644
index 0000000..bc7d2f2
--- /dev/null
+++ b/lib/helpers/normalize_path.js
@@ -0,0 +1,9 @@
+module.exports = function fixSlashes (url) {
+  if (!url) {
+    return url
+  }
+  url = url.replace(/\\\\/g, '/')
+    .replace(/\\/g, '/')
+
+  return url
+}
diff --git a/lib/index.js b/lib/index.js
index 4befef4..c5c9db5 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -7,6 +7,7 @@ const cheerio = require('cheerio')
 const tocify = require('./tocify')
 const indexify = require('./indexify')
 const fixHtml = require('./fix_html')
+const normalizePath = require('./helpers/normalize_path')
 const stripMarkdown = require('./helpers/strip_markdown')
 const md = require('./helpers/markdown')
 const memoize = require('./memoize')
@@ -224,7 +225,9 @@ function renderMarkdown (files, ms, done) {
 
   // render each page
   each(pages, (page, fname) => {
-    const file = externalSource(page.source) ? { contents: '' } : files[page.source]
+    // console.log(files)
+    const pageSource = normalizePath(page.source)
+    const file = externalSource(page.source) ? { contents: '' } : files[pageSource]
 
     const contents = file.contents.toString()
     const mdOptions = ms.metadata().markdown
@@ -248,7 +251,7 @@ function renderMarkdown (files, ms, done) {
     file.markdown = file.contents
     file.html = $.html()
     file.title = page.title
-    file.source = page.source
+    file.source = pageSource
     file.slug = page.slug
     file.contents = file.html
   })
diff --git a/lib/indexify.js b/lib/indexify.js
index a0e9f46..2e63e00 100644
--- a/lib/indexify.js
+++ b/lib/indexify.js
@@ -1,3 +1,5 @@
+const normalizePath = require('./helpers/normalize_path')
+
 /**
  * Turns a TOC into an index.
  *
@@ -15,8 +17,9 @@ module.exports = function indexify (toc) {
 
   function walk (item, rootTitle) {
     if (item.url) {
-      sources[item.source] = item.url
-      index[item.url] = {
+      const url = normalizePath(item.url)
+      sources[item.source] = url
+      index[url] = {
         source: item.source,
         title: rootTitle !== item.title ? `${item.title} - ${rootTitle}` : item.title,
         pageTitle: item.title,
diff --git a/lib/tocify.js b/lib/tocify.js
index 479b55b..840d814 100644
--- a/lib/tocify.js
+++ b/lib/tocify.js
@@ -4,8 +4,10 @@
 const marked = require('marked')
 const normalize = require('path').normalize
 const stripMarkdown = require('./helpers/strip_markdown')
+const normalizePath = require('./helpers/normalize_path')
 const assign = Object.assign
 
+const log = require('./log')
 const slugify = require('./slugify')
 const tocifyPage = require('./tocify_page')
 const externalSource = require('./external_source')
@@ -91,6 +93,8 @@ class Tocify {
       }
     })
 
+    log(`tocify(run): sources ${JSON.stringify(this.sources)}`)
+
     return re
   }
 
@@ -134,6 +138,9 @@ class Tocify {
     // `anchor`: Adds anchor (if needed)
     assign(item, anchorize(item.source))
 
+    // `source`: Handle OS specific paths
+    assign(item, pathify(item.source))
+
     // `source`: Takes care of relative (../) paths
     assign(item, absolutify(item.source, this.docs))
 
@@ -158,6 +165,8 @@ class Tocify {
       if (headings) item.headings = headings
     }
 
+    log(`tocify(itemify): item ${JSON.stringify(item)}`)
+
     return item
   }
 
@@ -223,7 +232,24 @@ function absolutify (source, root) {
 
   if (source.substr(0, 1) !== '/') {
     source = normalize(root + '/' + source)
+    source = normalizePath(source)
   }
   source = source.replace(/^\//, '')
   return { source }
 }
+
+/*
+ * Internal: takes care of OS specific paths.
+ *
+ *     pathify("..\README.md", "docs") => "../README.md"
+ *     pathify("\README.md", "docs")   => "/README.md"
+ */
+
+function pathify (source) {
+  if (externalSource(source)) {
+    return { source }
+  }
+
+  source = normalizePath(source)
+  return { source }
+}
diff --git a/test/index/invalid_refs_test.js b/test/index/invalid_refs_test.js
index 0ecc310..216e80f 100644
--- a/test/index/invalid_refs_test.js
+++ b/test/index/invalid_refs_test.js
@@ -26,6 +26,6 @@ describe('index/invalid refs:', function () {
   it('catches invalid references', function () {
     expect(this.err).toBeDefined()
     expect(this.err.message).toEqual(
-      "README.md: Unknown reference 'docs/getting-started.md'")
+      "README.md: Unknown reference 'docs/getting-started.md' (target: docs/getting-started.md)")
   })
 })
diff --git a/test/tocify/relative_test.js b/test/tocify/relative_test.js
index e9e8076..7590d2a 100644
--- a/test/tocify/relative_test.js
+++ b/test/tocify/relative_test.js
@@ -6,6 +6,7 @@ describe('tocify: relative', function () {
   let output
 
   it('handles relative URLs', function () {
+    debugger
     output = tocify([
       '* [Readme](../README.md)',
       '* [Install](install.md)'