diff --git a/Userland/Libraries/LibWeb/CSS/StyleInvalidator.cpp b/Userland/Libraries/LibWeb/CSS/StyleInvalidator.cpp
index 0fc2d4ffcd..0d0bd93137 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleInvalidator.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleInvalidator.cpp
@@ -29,12 +29,12 @@ StyleInvalidator::~StyleInvalidator()
         return;
     auto& style_computer = m_document.style_computer();
     m_document.for_each_in_inclusive_subtree_of_type<DOM::Element>([&](auto& element) {
-        auto maybe_matching_rules_before = m_elements_and_matching_rules_before.get(&element);
-        if (!maybe_matching_rules_before.has_value()) {
+        auto matching_rules_before_iter = m_elements_and_matching_rules_before.find(&element);
+        if (matching_rules_before_iter == m_elements_and_matching_rules_before.end()) {
             element.set_needs_style_update(true);
             return IterationDecision::Continue;
         }
-        auto& matching_rules_before = maybe_matching_rules_before.value();
+        auto& matching_rules_before = matching_rules_before_iter->value;
         auto matching_rules_after = style_computer.collect_matching_rules(element);
         if (matching_rules_before.size() != matching_rules_after.size()) {
             element.set_needs_style_update(true);