diff --git a/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.cpp b/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.cpp
index 2fbc4541a7e..27ff81fc7a6 100644
--- a/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.cpp
+++ b/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.cpp
@@ -24,10 +24,7 @@ float FilterOperation::Blur::resolved_radius(Layout::Node const& node) const
 
 float FilterOperation::HueRotate::angle_degrees(Layout::Node const& node) const
 {
-    // Default value when omitted is 0deg.
-    if (!angle.has_value())
-        return 0.0f;
-    return angle->visit([&](AngleOrCalculated const& a) { return a.resolved({ .length_resolution_context = Length::ResolutionContext::for_layout_node(node) })->to_degrees(); }, [&](Zero) { return 0.0; });
+    return angle.visit([&](AngleOrCalculated const& a) { return a.resolved({ .length_resolution_context = Length::ResolutionContext::for_layout_node(node) })->to_degrees(); }, [&](Zero) { return 0.0; });
 }
 
 float FilterOperation::Color::resolved_amount() const
@@ -75,15 +72,13 @@ String FilterValueListStyleValue::to_string(SerializationMode) const
             },
             [&](FilterOperation::HueRotate const& hue_rotate) {
                 builder.append("hue-rotate("sv);
-                if (hue_rotate.angle.has_value()) {
-                    hue_rotate.angle->visit(
-                        [&](Angle const& angle) {
-                            return builder.append(angle.to_string());
-                        },
-                        [&](auto&) {
-                            return builder.append('0');
-                        });
-                }
+                hue_rotate.angle.visit(
+                    [&](Angle const& angle) {
+                        builder.append(angle.to_string());
+                    },
+                    [&](auto&) {
+                        builder.append("0deg"sv);
+                    });
             },
             [&](FilterOperation::Color const& color) {
                 builder.appendff("{}(",
diff --git a/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.h b/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.h
index fe5687c5e30..a2f87c43823 100644
--- a/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.h
+++ b/Libraries/LibWeb/CSS/StyleValues/FilterValueListStyleValue.h
@@ -39,7 +39,7 @@ struct HueRotate {
         bool operator==(Zero const&) const = default;
     };
     using AngleOrZero = Variant<AngleOrCalculated, Zero>;
-    Optional<AngleOrZero> angle;
+    AngleOrZero angle { Angle::make_degrees(0) };
     float angle_degrees(Layout::Node const&) const;
     bool operator==(HueRotate const&) const = default;
 };
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-computed.txt b/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-computed.txt
index b599a03fc95..3ed60d237ee 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-computed.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-computed.txt
@@ -2,8 +2,8 @@ Harness status: OK
 
 Found 34 tests
 
-16 Pass
-18 Fail
+17 Pass
+17 Fail
 Pass	Property filter value 'none'
 Pass	Property filter value 'blur(100px)'
 Fail	Property filter value 'blur()'
@@ -21,7 +21,7 @@ Fail	Property filter value 'grayscale(2)'
 Fail	Property filter value 'grayscale(calc(2))'
 Pass	Property filter value 'grayscale()'
 Fail	Property filter value 'hue-rotate(90deg)'
-Fail	Property filter value 'hue-rotate()'
+Pass	Property filter value 'hue-rotate()'
 Pass	Property filter value 'invert(0)'
 Fail	Property filter value 'invert(100%)'
 Fail	Property filter value 'invert(2)'
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-parsing-valid.txt b/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-parsing-valid.txt
index 0db8824f6bb..88a86a4b900 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-parsing-valid.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/filter-effects/parsing/filter-parsing-valid.txt
@@ -2,8 +2,8 @@ Harness status: OK
 
 Found 39 tests
 
-30 Pass
-9 Fail
+31 Pass
+8 Fail
 Pass	e.style['filter'] = "none" should set the property value
 Pass	e.style['filter'] = "blur(100px)" should set the property value
 Pass	e.style['filter'] = "blur(0)" should set the property value
@@ -26,7 +26,7 @@ Pass	e.style['filter'] = "grayscale(calc(300%))" should set the property value
 Pass	e.style['filter'] = "grayscale(calc(101% * sign(1em - 1px)))" should set the property value
 Pass	e.style['filter'] = "grayscale()" should set the property value
 Fail	e.style['filter'] = "hue-rotate(90deg)" should set the property value
-Fail	e.style['filter'] = "hue-rotate(0)" should set the property value
+Pass	e.style['filter'] = "hue-rotate(0)" should set the property value
 Pass	e.style['filter'] = "hue-rotate()" should set the property value
 Pass	e.style['filter'] = "invert(0)" should set the property value
 Fail	e.style['filter'] = "invert(300%)" should set the property value