diff --git a/components/selectors/parser.rs b/components/selectors/parser.rs
index 0cb7c6e3f47f..e6c94d0eb878 100644
--- a/components/selectors/parser.rs
+++ b/components/selectors/parser.rs
@@ -1017,7 +1017,10 @@ fn parse_type_selector<'i, 't, P, E, Impl, S>(parser: &P, input: &mut CssParser<
                     sink.push(Component::DefaultNamespace(url))
                 }
                 QNamePrefix::ExplicitNamespace(prefix, url) => {
-                    sink.push(Component::Namespace(prefix, url))
+                    sink.push(match parser.default_namespace() {
+                        Some(ref default_url) if url == *default_url => Component::DefaultNamespace(url),
+                        _ => Component::Namespace(prefix, url),
+                    })
                 }
                 QNamePrefix::ExplicitNoNamespace => {
                     sink.push(Component::ExplicitNoNamespace)