diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.cpp
index 838ce31906..5efd151b7f 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.cpp
@@ -17,6 +17,7 @@
 #include <LibWeb/Fetch/Infrastructure/HTTP.h>
 #include <LibWeb/Fetch/Infrastructure/HTTP/Headers.h>
 #include <LibWeb/Infra/ByteSequences.h>
+#include <LibWeb/Loader/ResourceLoader.h>
 #include <LibWeb/MimeSniff/MimeType.h>
 
 namespace Web::Fetch::Infrastructure {
@@ -686,4 +687,11 @@ Optional<RangeHeaderValue> parse_single_range_header_value(ReadonlyBytes value)
     return RangeHeaderValue { move(range_start_value), move(range_end_value) };
 }
 
+// https://fetch.spec.whatwg.org/#default-user-agent-value
+ErrorOr<ByteBuffer> default_user_agent_value()
+{
+    // A default `User-Agent` value is an implementation-defined header value for the `User-Agent` header.
+    return ByteBuffer::copy(default_user_agent.bytes());
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.h
index 15ad9355e2..3b6515131e 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.h
@@ -74,5 +74,6 @@ struct RangeHeaderValue {
 [[nodiscard]] bool is_forbidden_response_header_name(ReadonlyBytes);
 [[nodiscard]] bool is_request_body_header_name(ReadonlyBytes);
 [[nodiscard]] Optional<RangeHeaderValue> parse_single_range_header_value(ReadonlyBytes);
+[[nodiscard]] ErrorOr<ByteBuffer> default_user_agent_value();
 
 }
diff --git a/Userland/Libraries/LibWeb/Loader/ResourceLoader.h b/Userland/Libraries/LibWeb/Loader/ResourceLoader.h
index 0c94b9ee2e..a013f17115 100644
--- a/Userland/Libraries/LibWeb/Loader/ResourceLoader.h
+++ b/Userland/Libraries/LibWeb/Loader/ResourceLoader.h
@@ -44,7 +44,7 @@ namespace Web {
 #    error Unknown OS
 #endif
 
-constexpr auto default_user_agent = "Mozilla/5.0 (" OS_STRING "; " CPU_STRING ") LibWeb+LibJS/1.0 Ladybird/1.0";
+constexpr auto default_user_agent = "Mozilla/5.0 (" OS_STRING "; " CPU_STRING ") LibWeb+LibJS/1.0 Ladybird/1.0"sv;
 
 class ResourceLoaderConnectorRequest : public RefCounted<ResourceLoaderConnectorRequest> {
 public: