diff --git a/components/style/servo/selector_parser.rs b/components/style/servo/selector_parser.rs
index 7302ab43645..0a1ffc9dbf6 100644
--- a/components/style/servo/selector_parser.rs
+++ b/components/style/servo/selector_parser.rs
@@ -406,11 +406,19 @@ impl NonTSPseudoClass {
 #[cfg_attr(feature = "servo", derive(MallocSizeOf))]
 pub struct SelectorImpl;
 
+/// A set of extra data to carry along with the matching context, either for
+/// selector-matching or invalidation.
+#[derive(Debug, Default)]
+pub struct ExtraMatchingData {
+    /// The invalidation data to invalidate doc-state pseudo-classes correctly.
+    pub invalidation_data: InvalidationMatchingData,
+}
+
 impl ::selectors::SelectorImpl for SelectorImpl {
     type PseudoElement = PseudoElement;
     type NonTSPseudoClass = NonTSPseudoClass;
 
-    type ExtraMatchingData = InvalidationMatchingData;
+    type ExtraMatchingData = ExtraMatchingData;
     type AttrValue = AtomString;
     type Identifier = AtomIdent;
     type LocalName = LocalName;