diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 8ecc6062dc..0d393690fc 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -42,6 +42,7 @@
 #include <LibWeb/CSS/StyleValues/FlexFlowStyleValue.h>
 #include <LibWeb/CSS/StyleValues/FlexStyleValue.h>
 #include <LibWeb/CSS/StyleValues/FontStyleValue.h>
+#include <LibWeb/CSS/StyleValues/FrequencyStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/Infra/Strings.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
index 8bb64f2558..91155c7c41 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
@@ -24,6 +24,7 @@
 #include <LibWeb/CSS/StyleValues/FlexFlowStyleValue.h>
 #include <LibWeb/CSS/StyleValues/FlexStyleValue.h>
 #include <LibWeb/CSS/StyleValues/FontStyleValue.h>
+#include <LibWeb/CSS/StyleValues/FrequencyStyleValue.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/BrowsingContext.h>
 #include <LibWeb/Loader/LoadRequest.h>
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValue.h
index 14e834705e..b30e6ea8c5 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.h
@@ -661,30 +661,6 @@ private:
     NonnullOwnPtr<CalcSum> m_expression;
 };
 
-class FrequencyStyleValue : public StyleValueWithDefaultOperators<FrequencyStyleValue> {
-public:
-    static ValueComparingNonnullRefPtr<FrequencyStyleValue> create(Frequency frequency)
-    {
-        return adopt_ref(*new FrequencyStyleValue(move(frequency)));
-    }
-    virtual ~FrequencyStyleValue() override { }
-
-    Frequency const& frequency() const { return m_frequency; }
-
-    virtual ErrorOr<String> to_string() const override { return m_frequency.to_string(); }
-
-    bool properties_equal(FrequencyStyleValue const& other) const { return m_frequency == other.m_frequency; };
-
-private:
-    explicit FrequencyStyleValue(Frequency frequency)
-        : StyleValueWithDefaultOperators(Type::Frequency)
-        , m_frequency(move(frequency))
-    {
-    }
-
-    Frequency m_frequency;
-};
-
 class GridTemplateAreaStyleValue final : public StyleValueWithDefaultOperators<GridTemplateAreaStyleValue> {
 public:
     static ValueComparingNonnullRefPtr<GridTemplateAreaStyleValue> create(Vector<Vector<String>> grid_template_area);
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValues/FrequencyStyleValue.h b/Userland/Libraries/LibWeb/CSS/StyleValues/FrequencyStyleValue.h
new file mode 100644
index 0000000000..37fd341486
--- /dev/null
+++ b/Userland/Libraries/LibWeb/CSS/StyleValues/FrequencyStyleValue.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
+ * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/CSS/Frequency.h>
+#include <LibWeb/CSS/StyleValue.h>
+
+namespace Web::CSS {
+
+class FrequencyStyleValue : public StyleValueWithDefaultOperators<FrequencyStyleValue> {
+public:
+    static ValueComparingNonnullRefPtr<FrequencyStyleValue> create(Frequency frequency)
+    {
+        return adopt_ref(*new FrequencyStyleValue(move(frequency)));
+    }
+    virtual ~FrequencyStyleValue() override = default;
+
+    Frequency const& frequency() const { return m_frequency; }
+
+    virtual ErrorOr<String> to_string() const override { return m_frequency.to_string(); }
+
+    bool properties_equal(FrequencyStyleValue const& other) const { return m_frequency == other.m_frequency; };
+
+private:
+    explicit FrequencyStyleValue(Frequency frequency)
+        : StyleValueWithDefaultOperators(Type::Frequency)
+        , m_frequency(move(frequency))
+    {
+    }
+
+    Frequency m_frequency;
+};
+
+}