diff --git a/app/browser/windows.js b/app/browser/windows.js
index 028aee44eed..5cf6767c228 100644
--- a/app/browser/windows.js
+++ b/app/browser/windows.js
@@ -5,6 +5,7 @@
 const {app, BrowserWindow, ipcMain} = require('electron')
 const appActions = require('../../js/actions/appActions')
 const appUrlUtil = require('../../js/lib/appUrlUtil')
+const {getLocationIfPDF} = require('../../js/lib/urlutil')
 const debounce = require('../../js/lib/debounce')
 const {getSetting} = require('../../js/settings')
 const locale = require('../locale')
@@ -75,7 +76,7 @@ const updatePinnedTabs = (win) => {
 
   pinnedSites.filter((site) =>
     pinnedTabs.find((tab) =>
-      tab.get('url') === site.get('location') &&
+      getLocationIfPDF(tab.get('url')) === site.get('location') &&
       (tab.get('partitionNumber') || 0) === (site.get('partitionNumber') || 0))).forEach((site) => {
         win.__alreadyPinnedSites = win.__alreadyPinnedSites.add(site)
       })
diff --git a/test/tab-components/pinnedTabTest.js b/test/tab-components/pinnedTabTest.js
index 513cef1da6c..8ad4b799c4d 100644
--- a/test/tab-components/pinnedTabTest.js
+++ b/test/tab-components/pinnedTabTest.js
@@ -51,6 +51,17 @@ describe('pinnedTabs', function () {
         .waitForElementCount(pinnedTabsTabs, 1)
         .waitForElementCount(tabsTabs, 1)
     })
+    it('can pin a PDF', function * () {
+      const pdfUrl = 'http://orimi.com/pdf-test.pdf'
+      yield this.app.client
+        .tabByIndex(0)
+        .url(pdfUrl)
+        .pause(1000) // wait for PDF load
+        .windowByUrl(Brave.browserWindowUrl)
+        .pinTabByIndex(0, true)
+        .waitForElementCount(pinnedTabsTabs, 2)
+        .waitForElementCount(tabsTabs, 0)
+    })
   })
 
   describe('Pinning with partitions', function () {