diff --git a/atom/browser/ui/file_dialog_gtk.cc b/atom/browser/ui/file_dialog_gtk.cc
index 463ad987a8..5885ffe361 100644
--- a/atom/browser/ui/file_dialog_gtk.cc
+++ b/atom/browser/ui/file_dialog_gtk.cc
@@ -22,7 +22,7 @@ gboolean FileFilterCaseInsensitive(const GtkFileFilterInfo* file_info,
   // Makes .* file extension matches all file types.
   if (*file_extension == ".*")
     return true;
-  return EndsWith(file_info->filename, *file_extension, false);
+  return base::EndsWith(file_info->filename, *file_extension, false);
 }
 
 // Deletes |data| when gtk_file_filter_add_custom() is done with it.
diff --git a/atom/browser/ui/x/x_window_utils.cc b/atom/browser/ui/x/x_window_utils.cc
index a15affb05f..e57122839c 100644
--- a/atom/browser/ui/x/x_window_utils.cc
+++ b/atom/browser/ui/x/x_window_utils.cc
@@ -41,7 +41,7 @@ void SetWindowType(::Window xwindow, const std::string& type) {
   XDisplay* xdisplay = gfx::GetXDisplay();
   std::string type_prefix = "_NET_WM_WINDOW_TYPE_";
   ::Atom window_type = XInternAtom(
-      xdisplay, (type_prefix + StringToUpperASCII(type)).c_str(), False);
+      xdisplay, (type_prefix + base::StringToUpperASCII(type)).c_str(), False);
   XChangeProperty(xdisplay, xwindow,
                   XInternAtom(xdisplay, "_NET_WM_WINDOW_TYPE", False),
                   XA_ATOM,