diff --git a/packages/react-cosmos-config/package.json b/packages/react-cosmos-config/package.json
index 5843db90ab..3d3b1f694f 100644
--- a/packages/react-cosmos-config/package.json
+++ b/packages/react-cosmos-config/package.json
@@ -11,7 +11,8 @@
   "main": "lib/index.js",
   "dependencies": {
     "react-cosmos-utils": "^2.0.0-beta.6",
-    "resolve-from": "^2.0.0"
+    "resolve-from": "^2.0.0",
+    "slash": "^1.0.0"
   },
   "xo": false
 }
diff --git a/packages/react-cosmos-config/src/__tests__/index.js b/packages/react-cosmos-config/src/__tests__/index.js
index be0f68e465..8a53595f57 100644
--- a/packages/react-cosmos-config/src/__tests__/index.js
+++ b/packages/react-cosmos-config/src/__tests__/index.js
@@ -1,4 +1,5 @@
 import path from 'path';
+import slash from 'slash';
 import getCosmosConfig from '../index';
 
 const mockUserConfig = (path, mockConfig) => {
@@ -50,11 +51,11 @@ describe('resolves module paths', () => {
   });
 
   test('global imports', () => {
-    expect(globalImports).toEqual([path.join(__dirname, '../../../react-cosmos-utils/src/import-module.js')]);
+    expect(globalImports).toEqual([slash(path.join(__dirname, '../../../react-cosmos-utils/src/import-module.js'))]);
   });
 
   test('proxies', () => {
-    expect(proxies).toEqual([path.join(__dirname, '../../../react-cosmos-utils/src/linked-list.js')]);
+    expect(proxies).toEqual([slash(path.join(__dirname, '../../../react-cosmos-utils/src/linked-list.js'))]);
   });
 });
 
@@ -128,27 +129,27 @@ describe('resolves relative paths', () => {
   });
 
   test('components', () => {
-    expect(componentPaths).toEqual([path.join(__dirname, 'mock-cwd/custom-path/path/to/components')]);
+    expect(componentPaths).toEqual([slash(path.join(__dirname, 'mock-cwd/custom-path/path/to/components'))]);
   });
 
   test('fixtures', () => {
-    expect(fixturePaths).toEqual([path.join(__dirname, 'mock-cwd/custom-path/path/to/fixtures')]);
+    expect(fixturePaths).toEqual([slash(path.join(__dirname, 'mock-cwd/custom-path/path/to/fixtures'))]);
   });
 
   test('global imports', () => {
-    expect(globalImports).toEqual([path.join(__dirname, 'mock-cwd/custom-path/path/to/import')]);
+    expect(globalImports).toEqual([slash(path.join(__dirname, 'mock-cwd/custom-path/path/to/import'))]);
   });
 
   test('proxies', () => {
-    expect(proxies).toEqual([path.join(__dirname, 'mock-cwd/custom-path/path/to/proxy')]);
+    expect(proxies).toEqual([slash(path.join(__dirname, 'mock-cwd/custom-path/path/to/proxy'))]);
   });
 
   test('public', () => {
-    expect(publicPath).toEqual(path.join(__dirname, 'mock-cwd/custom-path/path/to/static'));
+    expect(publicPath).toEqual(slash(path.join(__dirname, 'mock-cwd/custom-path/path/to/static')));
   });
 
   test('webpack config', () => {
-    expect(webpackConfigPath).toEqual(path.join(__dirname, 'mock-cwd/custom-path/path/to/webpack'));
+    expect(webpackConfigPath).toEqual(slash(path.join(__dirname, 'mock-cwd/custom-path/path/to/webpack')));
   });
 });
 
@@ -156,7 +157,7 @@ describe('defaults', () => {
   test('provide relative webpack path', () => {
     mockUserConfig('./mock-cwd/cosmos.config', {});
 
-    expect(getCosmosConfig().webpackConfigPath).toBe(path.join(__dirname, 'mock-cwd/webpack.config'));
+    expect(getCosmosConfig().webpackConfigPath).toBe(slash(path.join(__dirname, 'mock-cwd/webpack.config')));
   });
 
   test('provide hot reloading', () => {
diff --git a/packages/react-cosmos-config/src/index.js b/packages/react-cosmos-config/src/index.js
index 20e0a70a78..000c2cf588 100644
--- a/packages/react-cosmos-config/src/index.js
+++ b/packages/react-cosmos-config/src/index.js
@@ -1,11 +1,12 @@
 import path from 'path';
+import slash from 'slash';
 import resolveFrom from 'resolve-from';
 import importModule from 'react-cosmos-utils/lib/import-module';
 
 const resolveUserPath = (userPath, rootPath) =>
-  path.isAbsolute(userPath) ? userPath : (
+  slash(path.isAbsolute(userPath) ? userPath : (
     resolveFrom(rootPath, userPath) || path.join(rootPath, userPath)
-  );
+  ));
 
 const defaults = {
   componentPaths: [],
diff --git a/packages/react-cosmos-voyager/package.json b/packages/react-cosmos-voyager/package.json
index fd6d4c09cd..291a5c19f1 100644
--- a/packages/react-cosmos-voyager/package.json
+++ b/packages/react-cosmos-voyager/package.json
@@ -15,6 +15,7 @@
   "devDependencies": {
     "mkdirp": "^0.5.1",
     "rimraf": "^2.5.4",
+    "slash": "^1.0.0",
     "touch": "^1.0.0"
   },
   "dependencies": {
diff --git a/packages/react-cosmos-voyager/src/__tests__/index.js b/packages/react-cosmos-voyager/src/__tests__/index.js
index 2b37c576cf..4add46995e 100644
--- a/packages/react-cosmos-voyager/src/__tests__/index.js
+++ b/packages/react-cosmos-voyager/src/__tests__/index.js
@@ -1,8 +1,9 @@
 import path from 'path';
+import slash from 'slash';
 import traverse from 'traverse';
 import getFilePaths from '../index';
 
-const resolvePath = relPath => path.join(__dirname, '../use-cases', relPath);
+const resolvePath = relPath => slash(path.join(__dirname, '../use-cases', relPath));
 
 const testUseCase = (useCase, {
   componentPaths = [],
diff --git a/packages/react-cosmos-webpack/package.json b/packages/react-cosmos-webpack/package.json
index 552be726f4..6fb29e5994 100644
--- a/packages/react-cosmos-webpack/package.json
+++ b/packages/react-cosmos-webpack/package.json
@@ -23,6 +23,7 @@
     "react-cosmos-config": "^2.0.0-beta.7",
     "react-cosmos-utils": "^2.0.0-beta.6",
     "react-cosmos-voyager": "^2.0.0-beta.7",
+    "slash": "^1.0.0",
     "style-loader": "^0.13.1",
     "traverse": "^0.6.6",
     "webpack-dev-middleware": "^1.8.4",
diff --git a/packages/react-cosmos-webpack/src/__tests__/module-loader.js b/packages/react-cosmos-webpack/src/__tests__/module-loader.js
index a32d5ec6c4..486e3d90b9 100644
--- a/packages/react-cosmos-webpack/src/__tests__/module-loader.js
+++ b/packages/react-cosmos-webpack/src/__tests__/module-loader.js
@@ -28,7 +28,9 @@ const mockGetFilePaths = jest.fn(() => ({
 }));
 jest.mock('react-cosmos-voyager', () => mockGetFilePaths);
 
-const jsonLoader = require.resolve('json-loader');
+const slash = require('slash');
+
+const jsonLoader = slash(require.resolve('json-loader'));
 const moduleLoader = require('../module-loader');
 
 const mockAddDependency = jest.fn();
diff --git a/packages/react-cosmos-webpack/src/module-loader.js b/packages/react-cosmos-webpack/src/module-loader.js
index 1a44fc14c8..f7ba22d23b 100644
--- a/packages/react-cosmos-webpack/src/module-loader.js
+++ b/packages/react-cosmos-webpack/src/module-loader.js
@@ -1,10 +1,11 @@
 import path from 'path';
+import slash from 'slash';
 import loaderUtils from 'loader-utils';
 import traverse from 'traverse';
 import getCosmosConfig from 'react-cosmos-config';
 import getFilePaths from 'react-cosmos-voyager';
 
-const jsonLoader = require.resolve('json-loader');
+const jsonLoader = slash(require.resolve('json-loader'));
 
 const getRequirePath = filePath => (
   path.extname(filePath) === '.json' ? `${jsonLoader}!${filePath}` : filePath