diff --git a/views/bootstrap/class.ViewDocument.php b/views/bootstrap/class.ViewDocument.php
index a18c3de2d..90f51bd5e 100644
--- a/views/bootstrap/class.ViewDocument.php
+++ b/views/bootstrap/class.ViewDocument.php
@@ -646,7 +646,7 @@ $(document).ready( function() {
 					$this->contentHeading(getMLText("preview"));
 ?>
 			<div style="width:100%; height: 0; position:relative; padding-top: 141%;">
-			<iframe src="<?= $settings->_httpRoot ?>ext/pdfviewer/res/web/viewer.html?file=<?php echo urlencode(getBaseUrl().$settings->_httpRoot.'op/op.ViewOnline.php?documentid='.$latestContent->getDocument()->getID().'&version='.$latestContent->getVersion()); ?>" _width="100%" _height="100%" style="position: absolute; top: 0; left: 0; bottom: 0; right: 0; width: 100%; height: 100%"></iframe>
+			<iframe src="<?= $settings->_httpRoot ?>ext/pdfviewer/res/web/viewer.html?file=<?php echo urlencode($settings->getBaseUrlWithRoot().'op/op.ViewOnline.php?documentid='.$latestContent->getDocument()->getID().'&version='.$latestContent->getVersion()); ?>" _width="100%" _height="100%" style="position: absolute; top: 0; left: 0; bottom: 0; right: 0; width: 100%; height: 100%"></iframe>
 			</div>
 <?php
 					}
@@ -684,7 +684,7 @@ $(document).ready( function() {
 					$this->contentHeading(getMLText("preview_pdf"));
 ?>
 				<div style="width:100%; height: 0; position:relative; padding-top: 141%;">
-				<iframe src="<?= $settings->_httpRoot ?>ext/pdfviewer/res/web/viewer.html?file=<?php echo urlencode(getBaseUrl().$settings->_httpRoot.'op/op.PdfPreview.php?documentid='.$latestContent->getDocument()->getID().'&version='.$latestContent->getVersion()); ?>" _width="100%" _height="700px" style="position: absolute; top: 0; left: 0; bottom: 0; right: 0; width:    100%; height: 100%"></iframe>
+				<iframe src="<?= $settings->_httpRoot ?>ext/pdfviewer/res/web/viewer.html?file=<?php echo urlencode($settings->getBaseUrlWithRoot().'op/op.PdfPreview.php?documentid='.$latestContent->getDocument()->getID().'&version='.$latestContent->getVersion()); ?>" _width="100%" _height="700px" style="position: absolute; top: 0; left: 0; bottom: 0; right: 0; width:    100%; height: 100%"></iframe>
 				</div>
 <?php
 				}