diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 937d1422e1d..42c9997e691 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -1747,8 +1747,8 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
                 // If this element is the shadow root of an use-element shadow
                 // tree, according to the spec, we should not match rules
                 // cross the shadow DOM boundary.
-                e.get_local_name().as_ptr() == atom!("use").as_ptr() &&
-                e.get_namespace() == &*Namespace(atom!("http://www.w3.org/2000/svg"))
+                e.get_local_name() == &*local_name!("use") &&
+                e.get_namespace() == &*ns!("http://www.w3.org/2000/svg")
             },
             None => false,
         }
diff --git a/components/style/gecko_string_cache/namespace.rs b/components/style/gecko_string_cache/namespace.rs
index 9368c16286f..319f15222a9 100644
--- a/components/style/gecko_string_cache/namespace.rs
+++ b/components/style/gecko_string_cache/namespace.rs
@@ -13,7 +13,8 @@ use string_cache::{Atom, WeakAtom};
 
 #[macro_export]
 macro_rules! ns {
-    () => { $crate::string_cache::Namespace(atom!("")) }
+    () => { $crate::string_cache::Namespace(atom!("")) };
+    ($s: tt) => { $crate::string_cache::Namespace(atom!($s)) };
 }
 
 /// A Gecko namespace is just a wrapped atom.