diff --git a/widget/windows/winrt/nsWinMetroUtils.cpp b/widget/windows/winrt/nsWinMetroUtils.cpp
index 4de1d729668..8de0b6a85b7 100644
--- a/widget/windows/winrt/nsWinMetroUtils.cpp
+++ b/widget/windows/winrt/nsWinMetroUtils.cpp
@@ -378,7 +378,7 @@ nsWinMetroUtils::GetSupported(bool *aSupported)
   if (NS_SUCCEEDED(rv)) {
     rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_CURRENT_USER,
                       metroRegValuePath,
-                      nsIWindowsRegKey::ACCESS_WRITE);
+                      nsIWindowsRegKey::ACCESS_ALL);
     if (NS_SUCCEEDED(rv)) {
       rv = regKey->ReadIntValue(metroRegValueName, &value);
       if (NS_SUCCEEDED(rv)) {