diff --git a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp
index 509e2645bc..215f2e2048 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp
@@ -12,9 +12,9 @@
 
 namespace Web::CSS {
 
-CSSMediaRule* CSSMediaRule::create(JS::Realm& realm, MediaList& media_queries, CSSRuleList& rules)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSMediaRule>> CSSMediaRule::create(JS::Realm& realm, MediaList& media_queries, CSSRuleList& rules)
 {
-    return realm.heap().allocate<CSSMediaRule>(realm, realm, media_queries, rules).release_allocated_value_but_fixme_should_propagate_errors();
+    return MUST_OR_THROW_OOM(realm.heap().allocate<CSSMediaRule>(realm, realm, media_queries, rules));
 }
 
 CSSMediaRule::CSSMediaRule(JS::Realm& realm, MediaList& media, CSSRuleList& rules)
diff --git a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h
index 6ec7a4df68..227a31cc09 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h
@@ -18,7 +18,7 @@ class CSSMediaRule final : public CSSConditionRule {
     WEB_PLATFORM_OBJECT(CSSMediaRule, CSSConditionRule);
 
 public:
-    static CSSMediaRule* create(JS::Realm&, MediaList& media_queries, CSSRuleList&);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSMediaRule>> create(JS::Realm&, MediaList& media_queries, CSSRuleList&);
 
     virtual ~CSSMediaRule() = default;
 
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index c5bc1f6d33..f02b6dc81a 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -3058,7 +3058,7 @@ CSSRule* Parser::convert_to_rule(NonnullRefPtr<Rule> rule)
                     child_rules.append(child_rule);
             }
             auto* rule_list = CSSRuleList::create(m_context.realm(), child_rules);
-            return CSSMediaRule::create(m_context.realm(), *MediaList::create(m_context.realm(), move(media_query_list)), *rule_list);
+            return CSSMediaRule::create(m_context.realm(), *MediaList::create(m_context.realm(), move(media_query_list)), *rule_list).release_value_but_fixme_should_propagate_errors();
         }
         if (rule->at_rule_name().equals_ignoring_case("supports"sv)) {
             auto supports_tokens = TokenStream { rule->prelude() };