diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.html b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.html
index e0c7c37..54c283d 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.html
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface_test.html
@@ -441,28 +441,32 @@
 
     test('installing preloaded plugin', () => {
       let plugin;
-      window.ASSETS_PATH = 'http://blips.com/chitz/';
+      window.ASSETS_PATH = 'http://blips.com/chitz';
       Gerrit.install(p => { plugin = p; }, '0.1', 'preloaded:foo');
       assert.strictEqual(plugin.getPluginName(), 'foo');
       assert.strictEqual(plugin.url('/some/thing.html'),
-          'http://blips.com/plugins/foo/some/thing.html');
+          'http://blips.com/chitz/plugins/foo/some/thing.html');
       delete window.ASSETS_PATH;
     });
 
     suite('test plugin with base url', () => {
+      let baseUrlPlugin;
+
       setup(() => {
         sandbox.stub(Gerrit.BaseUrlBehavior, 'getBaseUrl').returns('/r');
 
         Gerrit._setPluginsCount(1);
-        Gerrit.install(p => { plugin = p; }, '0.1',
-            'http://test.com/r/plugins/testplugin/static/test.js');
+        Gerrit.install(p => { baseUrlPlugin = p; }, '0.1',
+            'http://test.com/r/plugins/baseurlplugin/static/test.js');
       });
 
       test('url', () => {
-        assert.notEqual(plugin.url(), 'http://test.com/plugins/testplugin/');
-        assert.equal(plugin.url(), 'http://test.com/r/plugins/testplugin/');
-        assert.equal(plugin.url('/static/test.js'),
-            'http://test.com/r/plugins/testplugin/static/test.js');
+        assert.notEqual(baseUrlPlugin.url(),
+            'http://test.com/plugins/baseurlplugin/');
+        assert.equal(baseUrlPlugin.url(),
+            'http://test.com/r/plugins/baseurlplugin/');
+        assert.equal(baseUrlPlugin.url('/static/test.js'),
+            'http://test.com/r/plugins/baseurlplugin/static/test.js');
       });
     });
 
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.js b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.js
index 36a428d..8bf4a2d 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.js
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.js
@@ -217,9 +217,14 @@
   };
 
   Plugin.prototype.url = function(opt_path) {
-    const base = Gerrit.BaseUrlBehavior.getBaseUrl();
-    return this._url.origin + base + '/plugins/' +
-        this._name + (opt_path || '/');
+    const relPath = '/plugins/' + this._name + (opt_path || '/');
+    if (window.location.origin === this._url.origin) {
+      // Plugin loaded from the same origin as gr-app, getBaseUrl in effect.
+      return this._url.origin + Gerrit.BaseUrlBehavior.getBaseUrl() + relPath;
+    } else {
+      // Plugin loaded from assets bundle, expect assets placed along with it.
+      return this._url.href.split('/plugins/' + this._name)[0] + relPath;
+    }
   };
 
   Plugin.prototype.screenUrl = function(opt_screenName) {