diff --git a/components/script/dom/element.rs b/components/script/dom/element.rs
index d461cd11527..155098247b6 100644
--- a/components/script/dom/element.rs
+++ b/components/script/dom/element.rs
@@ -1508,6 +1508,11 @@ impl Element {
             .unwrap_or_else(|_| USVString(value.to_owned()))
     }
 
+    pub fn set_url_attribute(&self, local_name: &LocalName, value: USVString) {
+        assert!(*local_name == local_name.to_ascii_lowercase());
+        self.set_attribute(local_name, AttrValue::String(value.to_string()));
+    }
+
     pub fn get_string_attribute(&self, local_name: &LocalName) -> DOMString {
         match self.get_attribute(&ns!(), local_name) {
             Some(x) => x.Value(),
diff --git a/components/script/dom/macros.rs b/components/script/dom/macros.rs
index 454f1a678f8..a566fee4fb6 100644
--- a/components/script/dom/macros.rs
+++ b/components/script/dom/macros.rs
@@ -112,8 +112,8 @@ macro_rules! make_url_setter(
             use crate::dom::bindings::inheritance::Castable;
             use crate::dom::element::Element;
             let element = self.upcast::<Element>();
-            element.set_string_attribute(&local_name!($htmlname),
-                                         DOMString::from(value.0));
+            element.set_url_attribute(&local_name!($htmlname),
+                                         value);
         }
     );
 );