diff --git a/src/lib/viewers/doc/DocBaseViewer.js b/src/lib/viewers/doc/DocBaseViewer.js
index 6d7a8fa95..b804f34ec 100644
--- a/src/lib/viewers/doc/DocBaseViewer.js
+++ b/src/lib/viewers/doc/DocBaseViewer.js
@@ -540,7 +540,7 @@ class DocBaseViewer extends BaseViewer {
 
         // Fix incorrectly cached range requests on older versions of iOS webkit browsers,
         // see: https://bugs.webkit.org/show_bug.cgi?id=82672
-        if (this.isMobile && Browser.isIOS()) {
+        if (Browser.isIOS()) {
             docInitParams.httpHeaders = {
                 'If-None-Match': 'webkit-no-cache'
             };
diff --git a/src/lib/viewers/doc/__tests__/DocBaseViewer-test.js b/src/lib/viewers/doc/__tests__/DocBaseViewer-test.js
index b4db85d10..fc70676f7 100644
--- a/src/lib/viewers/doc/__tests__/DocBaseViewer-test.js
+++ b/src/lib/viewers/doc/__tests__/DocBaseViewer-test.js
@@ -838,7 +838,6 @@ describe('src/lib/viewers/doc/DocBaseViewer', () => {
             docBase.options.location = {
                 locale: 'en-US'
             };
-            docBase.isMobile = true;
             sandbox.stub(Browser, 'isIOS').returns(true);
             sandbox.stub(PDFJS, 'getDocument').returns(Promise.resolve({}));