diff --git a/Userland/Libraries/LibWeb/Bindings/PlatformObject.h b/Userland/Libraries/LibWeb/Bindings/PlatformObject.h
index f63abc9149..51b98bb790 100644
--- a/Userland/Libraries/LibWeb/Bindings/PlatformObject.h
+++ b/Userland/Libraries/LibWeb/Bindings/PlatformObject.h
@@ -12,13 +12,13 @@
 
 namespace Web::Bindings {
 
-#define WEB_PLATFORM_OBJECT(class_, base_class)                                   \
-    JS_OBJECT(class_, base_class)                                                 \
-    virtual bool implements_interface(ByteString const& interface) const override \
-    {                                                                             \
-        if (interface == #class_)                                                 \
-            return true;                                                          \
-        return Base::implements_interface(interface);                             \
+#define WEB_PLATFORM_OBJECT(class_, base_class)                               \
+    JS_OBJECT(class_, base_class)                                             \
+    virtual bool implements_interface(String const& interface) const override \
+    {                                                                         \
+        if (interface == #class_)                                             \
+            return true;                                                      \
+        return Base::implements_interface(interface);                         \
     }
 
 // https://webidl.spec.whatwg.org/#dfn-platform-object
@@ -37,7 +37,7 @@ public:
 
     // https://webidl.spec.whatwg.org/#implements
     // This is implemented by overrides that get generated by the WEB_PLATFORM_OBJECT macro.
-    [[nodiscard]] virtual bool implements_interface(ByteString const&) const { return false; }
+    [[nodiscard]] virtual bool implements_interface(String const&) const { return false; }
 
 protected:
     explicit PlatformObject(JS::Realm&, MayInterfereWithIndexedPropertyAccess = MayInterfereWithIndexedPropertyAccess::No);
diff --git a/Userland/Libraries/LibWeb/WebIDL/OverloadResolution.cpp b/Userland/Libraries/LibWeb/WebIDL/OverloadResolution.cpp
index 4298a8b527..8678c460b2 100644
--- a/Userland/Libraries/LibWeb/WebIDL/OverloadResolution.cpp
+++ b/Userland/Libraries/LibWeb/WebIDL/OverloadResolution.cpp
@@ -165,7 +165,7 @@ JS::ThrowCompletionOr<ResolvedOverload> resolve_overload(JS::VM& vm, IDL::Effect
         else if (value.is_object() && is<Bindings::PlatformObject>(value.as_object())
             && has_overload_with_argument_type_or_subtype_matching(overloads, i, [value](IDL::Type const& type) {
                    // - an interface type that V implements
-                   if (static_cast<Bindings::PlatformObject const&>(value.as_object()).implements_interface(type.name()))
+                   if (static_cast<Bindings::PlatformObject const&>(value.as_object()).implements_interface(MUST(String::from_byte_string(type.name()))))
                        return true;
 
                    // - object