diff --git a/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.cpp
index 7890656ccb..34895f99bd 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.cpp
@@ -9,12 +9,13 @@
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/CSS/CSSFontFaceRule.h>
 #include <LibWeb/CSS/Serialize.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::CSS {
 
-CSSFontFaceRule* CSSFontFaceRule::create(JS::Realm& realm, FontFace&& font_face)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSFontFaceRule>> CSSFontFaceRule::create(JS::Realm& realm, FontFace&& font_face)
 {
-    return realm.heap().allocate<CSSFontFaceRule>(realm, realm, move(font_face)).release_allocated_value_but_fixme_should_propagate_errors();
+    return MUST_OR_THROW_OOM(realm.heap().allocate<CSSFontFaceRule>(realm, realm, move(font_face)));
 }
 
 CSSFontFaceRule::CSSFontFaceRule(JS::Realm& realm, FontFace&& font_face)
diff --git a/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h b/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h
index fe08427d46..ab6263bdfb 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h
@@ -16,7 +16,7 @@ class CSSFontFaceRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSFontFaceRule, CSSRule);
 
 public:
-    static CSSFontFaceRule* create(JS::Realm&, FontFace&&);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSFontFaceRule>> create(JS::Realm&, FontFace&&);
 
     virtual ~CSSFontFaceRule() override = default;
 
diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 9e43248edf..a0e6514595 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -5394,7 +5394,7 @@ CSSRule* Parser::parse_font_face_rule(TokenStream<ComponentValue>& tokens)
         unicode_range.empend(0x0u, 0x10FFFFu);
     }
 
-    return CSSFontFaceRule::create(m_context.realm(), FontFace { font_family.release_value(), move(src), move(unicode_range) });
+    return CSSFontFaceRule::create(m_context.realm(), FontFace { font_family.release_value(), move(src), move(unicode_range) }).release_value_but_fixme_should_propagate_errors();
 }
 
 Vector<FontFace::Source> Parser::parse_font_face_src(TokenStream<ComponentValue>& component_values)