diff --git a/package.json b/package.json
index 233cacf588..5a862b9007 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "debounce": "^1.0.0",
     "eslint": "3.4.0",
     "eslint-config-openlayers": "5.0.0",
-    "eslint-plugin-openlayers-internal": "2.1.0",
+    "eslint-plugin-openlayers-internal": "file:rules",
     "expect.js": "0.3.1",
     "gaze": "^1.0.0",
     "istanbul": "0.4.5",
diff --git a/rules/no-missing-requires.js b/rules/no-missing-requires.js
index e0ef07dda4..651529126f 100644
--- a/rules/no-missing-requires.js
+++ b/rules/no-missing-requires.js
@@ -9,8 +9,9 @@ const util = require('./util');
  *   if so, require the "namespace" (ol.foo)
  * 2. check if a name looks like a class (ol.foo.Bar or ol.foo.XYZ)
  *   if so, require the class (ol.foo.Bar)
- * 3. otherwise, lop off the last part of a name and require the rest
- *   (e.g. ol.foo.bar would require ol.foo)
+ * 3. otherwise, unless it's an external dependency (ol.ext.*), lop off the last
+ *   part of a name and require the rest (e.g. ol.foo.bar would require ol.foo,
+ *   but ol.ext.foo would require ol.ext.foo)
  */
 
 const CONST_RE = /^(ol(\.[a-z]\w*)*)\.[A-Z]+_([_A-Z])+$/;
@@ -76,7 +77,10 @@ exports.rule = {
             }
             // otherwise, assume the object should be required
             const parts = name.split('.');
-            parts.pop();
+            if (parts[1] !== 'ext') {
+              // unless it's an ol.ext.*
+              parts.pop();
+            }
             const objectName = parts.join('.');
             if (!defined[objectName]) {
               context.report(expression, `Missing goog.require('${objectName}')`);
diff --git a/rules/package.json b/rules/package.json
index bdd4291e0e..83d07489d8 100644
--- a/rules/package.json
+++ b/rules/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint-plugin-openlayers-internal",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "description": "Custom ESLint rules for the OpenLayers project",
   "main": "index.js",
   "repository": {