diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9a08b114..1f3c66cf6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 
 ## [Unreleased]
 
+- [`order`]: Adds support for correctly sorting unknown types into a single group (thanks [@swernerx])
+
 ## [2.17.3] - 2019-05-23
 
 ### Fixed
diff --git a/docs/rules/order.md b/docs/rules/order.md
index 45bde6acc..88ddca46f 100644
--- a/docs/rules/order.md
+++ b/docs/rules/order.md
@@ -77,7 +77,7 @@ This rule supports the following options:
 
 ### `groups: [array]`:
 
-How groups are defined, and the order to respect. `groups` must be an array of `string` or [`string`]. The only allowed `string`s are: `"builtin"`, `"external"`, `"internal"`, `"parent"`, `"sibling"`, `"index"`. The enforced order is the same as the order of each element in a group. Omitted types are implicitly grouped together as the last element. Example:
+How groups are defined, and the order to respect. `groups` must be an array of `string` or [`string`]. The only allowed `string`s are: `"builtin"`, `"external"`, `"internal"`, `"unknown"`, `"parent"`, `"sibling"`, `"index"`. The enforced order is the same as the order of each element in a group. Omitted types are implicitly grouped together as the last element. Example:
 ```js
 [
   'builtin', // Built-in types are first
diff --git a/src/rules/order.js b/src/rules/order.js
index 685671bfc..3d3e1b96b 100644
--- a/src/rules/order.js
+++ b/src/rules/order.js
@@ -259,7 +259,7 @@ function isInVariableDeclarator(node) {
     (node.type === 'VariableDeclarator' || isInVariableDeclarator(node.parent))
 }
 
-const types = ['builtin', 'external', 'internal', 'parent', 'sibling', 'index']
+const types = ['builtin', 'external', 'internal', 'unknown', 'parent', 'sibling', 'index']
 
 // Creates an object with type-rank pairs.
 // Example: { index: 0, sibling: 1, parent: 1, external: 1, builtin: 2, internal: 2 }
diff --git a/tests/src/rules/order.js b/tests/src/rules/order.js
index 477ed8a7a..b310dd07f 100644
--- a/tests/src/rules/order.js
+++ b/tests/src/rules/order.js
@@ -164,6 +164,46 @@ ruleTester.run('order', rule, {
         var index = require('./');
       `,
     }),
+    // Addijg unknown import types (e.g. using an resolver alias via babel) to the groups.
+    test({
+      code: `
+        import fs from 'fs';
+        import { Input } from '-/components/Input';
+        import { Button } from '-/components/Button';
+        import { add } from './helper';`,
+      options: [{
+        groups: ['builtin', 'external', 'unknown', 'parent', 'sibling', 'index'],
+      }],
+    }),
+    // Using unknown import types (e.g. using an resolver alias via babel) with
+    // an alternative custom group list.
+    test({
+      code: `
+        import { Input } from '-/components/Input';
+        import { Button } from '-/components/Button';
+        import fs from 'fs';
+        import { add } from './helper';`,
+      options: [{
+        groups: [ 'unknown', 'builtin', 'external', 'parent', 'sibling', 'index' ],
+      }],
+    }),
+    // Using unknown import types (e.g. using an resolver alias via babel)
+    // Option: newlines-between: 'always'
+    test({
+      code: `
+        import fs from 'fs';
+
+        import { Input } from '-/components/Input';
+        import { Button } from '-/components/Button';
+
+        import { add } from './helper';`,
+      options: [
+        {
+          'newlines-between': 'always',
+          groups: ['builtin', 'external', 'unknown', 'parent', 'sibling', 'index'],
+        },
+      ],
+    }),
     // Option: newlines-between: 'always'
     test({
       code: `
@@ -885,6 +925,63 @@ ruleTester.run('order', rule, {
         message: '`fs` import should occur after import of `../foo/bar`',
       }],
     }),
+    // Default order using import with custom import alias
+    test({
+      code: `
+        import { Button } from '-/components/Button';
+        import { add } from './helper';
+        import fs from 'fs';
+      `,
+      output: `
+        import fs from 'fs';
+        import { Button } from '-/components/Button';
+        import { add } from './helper';
+      `,
+      options: [
+        {
+          groups: ['builtin', 'external', 'unknown', 'parent', 'sibling', 'index'],
+        },
+      ],
+      errors: [
+        {
+          line: 4,
+          message: '`fs` import should occur before import of `-/components/Button`',
+        },
+      ],
+    }),
+    // Default order using import with custom import alias
+    test({
+      code: `
+        import fs from 'fs';
+        import { Button } from '-/components/Button';
+        import { LinkButton } from '-/components/Link';
+        import { add } from './helper';
+      `,
+      output: `
+        import fs from 'fs';
+
+        import { Button } from '-/components/Button';
+        import { LinkButton } from '-/components/Link';
+
+        import { add } from './helper';
+      `,
+      options: [
+        {
+          groups: ['builtin', 'external', 'unknown', 'parent', 'sibling', 'index'],
+          'newlines-between': 'always',
+        },
+      ],
+      errors: [
+        {
+          line: 2,
+          message: 'There should be at least one empty line between import groups',
+        },
+        {
+          line: 4,
+          message: 'There should be at least one empty line between import groups',
+        },
+      ],
+    }),
     // Option newlines-between: 'never' - should report unnecessary line between groups
     test({
       code: `