diff --git a/Libraries/LibWeb/CSS/NumericType.cpp b/Libraries/LibWeb/CSS/NumericType.cpp
index 46c40638f6d..77def71215e 100644
--- a/Libraries/LibWeb/CSS/NumericType.cpp
+++ b/Libraries/LibWeb/CSS/NumericType.cpp
@@ -39,18 +39,18 @@ Optional<NumericType::BaseType> NumericType::base_type_from_value_type(ValueType
 }
 
 // https://drafts.css-houdini.org/css-typed-om-1/#cssnumericvalue-create-a-type
-Optional<NumericType> NumericType::create_from_unit(StringView unit)
+Optional<NumericType> NumericType::create_from_unit(FlyString const& unit)
 {
     // To create a type from a string unit, follow the appropriate branch of the following:
 
     // unit is "number"
-    if (unit == "number"sv) {
+    if (unit == "number"_fly_string) {
         // Return «[ ]» (empty map)
         return NumericType {};
     }
 
     // unit is "percent"
-    if (unit == "percent"sv) {
+    if (unit == "percent"_fly_string) {
         // Return «[ "percent" → 1 ]»
         return NumericType { BaseType::Percent, 1 };
     }
diff --git a/Libraries/LibWeb/CSS/NumericType.h b/Libraries/LibWeb/CSS/NumericType.h
index 8fe2978fe88..46ba1b12d9e 100644
--- a/Libraries/LibWeb/CSS/NumericType.h
+++ b/Libraries/LibWeb/CSS/NumericType.h
@@ -51,7 +51,7 @@ public:
         VERIFY_NOT_REACHED();
     }
 
-    static Optional<NumericType> create_from_unit(StringView unit);
+    static Optional<NumericType> create_from_unit(FlyString const& unit);
     NumericType() = default;
     NumericType(BaseType type, i32 power)
     {