diff --git a/atom/browser/atom_resource_dispatcher_host_delegate.cc b/atom/browser/atom_resource_dispatcher_host_delegate.cc
index 53c7cf094035..19359e2ca549 100644
--- a/atom/browser/atom_resource_dispatcher_host_delegate.cc
+++ b/atom/browser/atom_resource_dispatcher_host_delegate.cc
@@ -86,10 +86,11 @@ void OnPdfResourceIntercepted(
   // The URL passes the original pdf resource url, that will be requested
   // by the webui page.
   // chrome://pdf-viewer/index.html?src=https://somepage/123.pdf
-  GURL escaped_url(net::EscapeUrlEncodedData(original_url.spec(), true));
   content::NavigationController::LoadURLParams params(
-      GURL(base::StringPrintf("%sindex.html?%s=%s", kPdfViewerUIOrigin,
-                              kPdfPluginSrc, escaped_url.spec().c_str())));
+      GURL(base::StringPrintf("%sindex.html?%s=%s",
+                              kPdfViewerUIOrigin,
+                              kPdfPluginSrc,
+                              net::EscapeUrlEncodedData(original_url.spec(), false).c_str())));
   web_contents->GetController().LoadURLWithParams(params);
 }
 
diff --git a/atom/browser/atom_web_ui_controller_factory.cc b/atom/browser/atom_web_ui_controller_factory.cc
index 57a76e05cc77..d113e656084a 100644
--- a/atom/browser/atom_web_ui_controller_factory.cc
+++ b/atom/browser/atom_web_ui_controller_factory.cc
@@ -55,10 +55,9 @@ AtomWebUIControllerFactory::CreateWebUIControllerForURL(content::WebUI* web_ui,
     std::string stream_id, src;
 
     const net::UnescapeRule::Type unescape_rules =
-      net::UnescapeRule::SPOOFING_AND_CONTROL_CHARS |
       net::UnescapeRule::SPACES | net::UnescapeRule::PATH_SEPARATORS |
       net::UnescapeRule::URL_SPECIAL_CHARS_EXCEPT_PATH_SEPARATORS |
-      net::UnescapeRule::NORMAL | net::UnescapeRule::REPLACE_PLUS_WITH_SPACE;
+      net::UnescapeRule::REPLACE_PLUS_WITH_SPACE;
 
     for (const auto& param : toplevel_params) {
       if (param.first == kPdfPluginSrc) {