diff --git a/Libraries/LibWeb/CSS/MediaQuery.h b/Libraries/LibWeb/CSS/MediaQuery.h
index 3c5edded845..e760c134ca1 100644
--- a/Libraries/LibWeb/CSS/MediaQuery.h
+++ b/Libraries/LibWeb/CSS/MediaQuery.h
@@ -96,7 +96,7 @@ private:
 // https://www.w3.org/TR/mediaqueries-4/#mq-features
 class MediaFeature final : public BooleanExpression {
 public:
-    enum class Comparison {
+    enum class Comparison : u8 {
         Equal,
         LessThan,
         LessThanOrEqual,
@@ -151,7 +151,7 @@ public:
     virtual void dump(StringBuilder&, int indent_levels = 0) const override;
 
 private:
-    enum class Type {
+    enum class Type : u8 {
         IsTrue,
         ExactValue,
         MinValue,
diff --git a/Libraries/LibWeb/Forward.h b/Libraries/LibWeb/Forward.h
index 7a857b6fccc..3d863ee4790 100644
--- a/Libraries/LibWeb/Forward.h
+++ b/Libraries/LibWeb/Forward.h
@@ -310,7 +310,7 @@ class URLStyleValue;
 class VisualViewport;
 
 enum class Keyword;
-enum class MediaFeatureID;
+enum class MediaFeatureID : u8;
 enum class PropertyID;
 
 struct BackgroundLayerData;
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp
index 992952dd459..6816af98db9 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSMediaFeatureID.cpp
@@ -42,6 +42,9 @@ ErrorOr<void> generate_header_file(JsonObject& media_feature_data, Core::File& f
 {
     StringBuilder builder;
     SourceGenerator generator { builder };
+
+    generator.set("media_feature_id_underlying_type", underlying_type_for_enum(media_feature_data.size()));
+
     generator.append(R"~~~(#pragma once
 
 #include <AK/StringView.h>
@@ -58,7 +61,7 @@ enum class MediaFeatureValueType {
     Resolution,
 };
 
-enum class MediaFeatureID {)~~~");
+enum class MediaFeatureID : @media_feature_id_underlying_type@ {)~~~");
 
     media_feature_data.for_each_member([&](auto& name, auto&) {
         auto member_generator = generator.fork();