diff --git a/mocks/jsconfig.json b/mocks/jsconfig.json
index 7ac4649..0952d71 100644
--- a/mocks/jsconfig.json
+++ b/mocks/jsconfig.json
@@ -6,7 +6,14 @@
       "@dir/*": ["./src/dir/*"],
       "@dir2/*": ["././src/dir2/*"],
       "$dir3/*": ["src/dir3/*", "src/dir3"],
-      "my-package": ["./node_modules/some-package", "./node_modules/some-package/*"],
+      "my-package": [
+        "./node_modules/some-package",
+        "./node_modules/some-package/*"
+      ],
+      "external-package": [
+        "/absolute_path/external-package",
+        "/absolute_path/external-package/*"
+      ],
       "@material-ui": ["node_modules/@material-ui/ie-10/ie-10.js"]
     }
   }
diff --git a/mocks/tsconfig.paths.json b/mocks/tsconfig.paths.json
index 0faa7cc..0952d71 100644
--- a/mocks/tsconfig.paths.json
+++ b/mocks/tsconfig.paths.json
@@ -6,7 +6,14 @@
       "@dir/*": ["./src/dir/*"],
       "@dir2/*": ["././src/dir2/*"],
       "$dir3/*": ["src/dir3/*", "src/dir3"],
-      "my-package": ["./node_modules/some-package/*", "./node_modules/some-package"],
+      "my-package": [
+        "./node_modules/some-package",
+        "./node_modules/some-package/*"
+      ],
+      "external-package": [
+        "/absolute_path/external-package",
+        "/absolute_path/external-package/*"
+      ],
       "@material-ui": ["node_modules/@material-ui/ie-10/ie-10.js"]
     }
   }
diff --git a/plugin/extract-aliases/index.js b/plugin/extract-aliases/index.js
index e34e1a0..735ac71 100644
--- a/plugin/extract-aliases/index.js
+++ b/plugin/extract-aliases/index.js
@@ -28,7 +28,7 @@ const extractAliases = ({ pluginOptions, context: { paths } }) => {
   const { appPath } = paths
   const { baseUrl } = options
 
-  const absoluteBaseUrl = path.join(appPath, baseUrl)
+  const absoluteBaseUrl = path.resolve(appPath, baseUrl)
 
   if (options.source === 'jsconfig')
     return extractAliasesFromConfig({
diff --git a/plugin/extract-aliases/index.test.js b/plugin/extract-aliases/index.test.js
index e127cd1..94fedb2 100644
--- a/plugin/extract-aliases/index.test.js
+++ b/plugin/extract-aliases/index.test.js
@@ -3,8 +3,8 @@ const extractAliases = require('.')
 
 describe('extract-aliases', () => {
   const appPath = path.resolve(__dirname, '../..')
-  const appJsConfig = path.join(appPath, 'mocks/jsconfig.json')
-  const tsConfigPath = path.join(appPath, 'mocks/tsconfig.paths.json')
+  const appJsConfig = path.resolve(appPath, 'mocks/jsconfig.json')
+  const tsConfigPath = path.resolve(appPath, 'mocks/tsconfig.paths.json')
 
   const context = {
     paths: {
@@ -24,6 +24,7 @@ describe('extract-aliases', () => {
           '@dir2': '././src/dir2/',
           '$dir3': 'src/dir3',
           'my-package': './node_modules/some-package',
+          'external-package': '/absolute_path/external-package',
           '@material-ui': 'node_modules/@material-ui/ie-10/ie-10.js',
         },
       },
@@ -45,13 +46,17 @@ describe('extract-aliases', () => {
   }
 
   const result = {
-    '@file': path.join(appPath, './src/file.js'),
-    '@file2': path.join(appPath, './src/file2.js'),
-    '@dir': path.join(appPath, './src/dir'),
-    '@dir2': path.join(appPath, './src/dir2'),
-    '$dir3': path.join(appPath, './src/dir3'),
-    'my-package': path.join(appPath, './node_modules/some-package'),
-    '@material-ui': path.join(
+    '@file': path.resolve(appPath, './src/file.js'),
+    '@file2': path.resolve(appPath, './src/file2.js'),
+    '@dir': path.resolve(appPath, './src/dir'),
+    '@dir2': path.resolve(appPath, './src/dir2'),
+    '$dir3': path.resolve(appPath, './src/dir3'),
+    'my-package': path.resolve(appPath, './node_modules/some-package'),
+    'external-package': path.resolve(
+      appPath,
+      '/absolute_path/external-package'
+    ),
+    '@material-ui': path.resolve(
       appPath,
       './node_modules/@material-ui/ie-10/ie-10.js'
     ),
diff --git a/plugin/extract-aliases/normalize-aliases.js b/plugin/extract-aliases/normalize-aliases.js
index 330dda6..149e4a9 100644
--- a/plugin/extract-aliases/normalize-aliases.js
+++ b/plugin/extract-aliases/normalize-aliases.js
@@ -8,7 +8,7 @@ const normalizeAliases = ({ absoluteBaseUrl, aliases }) => {
     const cleanAlias = aliases[aliasName].replace(/\/$/, '')
 
     // make alias path absolute
-    result[aliasName] = path.join(absoluteBaseUrl, cleanAlias)
+    result[aliasName] = path.resolve(absoluteBaseUrl, cleanAlias)
   }
 
   return result
diff --git a/plugin/extract-aliases/normalize-aliases.test.js b/plugin/extract-aliases/normalize-aliases.test.js
index a578637..3c935c4 100644
--- a/plugin/extract-aliases/normalize-aliases.test.js
+++ b/plugin/extract-aliases/normalize-aliases.test.js
@@ -9,7 +9,7 @@ describe('normalize-aliases', () => {
   test('should correctly normalize aliases', () => {
     expect(
       normalizeAliases({
-        absoluteBaseUrl: path.join(appPath, '.'),
+        absoluteBaseUrl: path.resolve(appPath, '.'),
         aliases: {
           '@file': './src/file.js',
           '@file2': 'src/file2.js',
@@ -17,17 +17,22 @@ describe('normalize-aliases', () => {
           '@dir2': '././src/dir2/',
           '$dir3': 'src/dir3',
           'my-package': './node_modules/some-package',
+          'external-package': '/absolute_path/external-package',
           '@material-ui': 'node_modules/@material-ui/ie-10/ie-10.js',
         },
       })
     ).toEqual({
-      '@file': path.join(appPath, './src/file.js'),
-      '@file2': path.join(appPath, './src/file2.js'),
-      '@dir': path.join(appPath, './src/dir'),
-      '@dir2': path.join(appPath, './src/dir2'),
-      '$dir3': path.join(appPath, './src/dir3'),
-      'my-package': path.join(appPath, './node_modules/some-package'),
-      '@material-ui': path.join(
+      '@file': path.resolve(appPath, './src/file.js'),
+      '@file2': path.resolve(appPath, './src/file2.js'),
+      '@dir': path.resolve(appPath, './src/dir'),
+      '@dir2': path.resolve(appPath, './src/dir2'),
+      '$dir3': path.resolve(appPath, './src/dir3'),
+      'my-package': path.resolve(appPath, './node_modules/some-package'),
+      'external-package': path.resolve(
+        appPath,
+        '/absolute_path/external-package'
+      ),
+      '@material-ui': path.resolve(
         appPath,
         './node_modules/@material-ui/ie-10/ie-10.js'
       ),
@@ -35,7 +40,7 @@ describe('normalize-aliases', () => {
 
     expect(
       normalizeAliases({
-        absoluteBaseUrl: path.join(appPath, './src'),
+        absoluteBaseUrl: path.resolve(appPath, './src'),
         aliases: {
           '@file': './file.js',
           '@file2': 'file2.js',
@@ -45,11 +50,11 @@ describe('normalize-aliases', () => {
         },
       })
     ).toEqual({
-      '@file': path.join(appPath, './src/file.js'),
-      '@file2': path.join(appPath, './src/file2.js'),
-      '@dir': path.join(appPath, './src/dir'),
-      '@dir2': path.join(appPath, './src/dir2'),
-      '$dir3': path.join(appPath, './src/dir3'),
+      '@file': path.resolve(appPath, './src/file.js'),
+      '@file2': path.resolve(appPath, './src/file2.js'),
+      '@dir': path.resolve(appPath, './src/dir'),
+      '@dir2': path.resolve(appPath, './src/dir2'),
+      '$dir3': path.resolve(appPath, './src/dir3'),
     })
   })
 })