diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 8547a47bb9f..319fdb56ba8 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -33,6 +33,7 @@ enum class CanvasFillRule;
 enum class DOMParserSupportedType;
 enum class EndingType;
 enum class ImageSmoothingQuality;
+enum class ReadableStreamReaderMode;
 enum class ReferrerPolicy;
 enum class RequestCache;
 enum class RequestCredentials;
@@ -553,6 +554,7 @@ class WritableStreamDefaultWriter;
 struct PullIntoDescriptor;
 struct QueuingStrategy;
 struct QueuingStrategyInit;
+struct ReadableStreamGetReaderOptions;
 struct UnderlyingSink;
 struct UnderlyingSource;
 }
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp b/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp
index 1b88812e534..a9ffae89652 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp
@@ -93,14 +93,17 @@ WebIDL::ExceptionOr<JS::GCPtr<JS::Object>> ReadableStream::cancel(JS::Value reas
 }
 
 // https://streams.spec.whatwg.org/#rs-get-reader
-WebIDL::ExceptionOr<ReadableStreamReader> ReadableStream::get_reader()
+WebIDL::ExceptionOr<ReadableStreamReader> ReadableStream::get_reader(ReadableStreamGetReaderOptions const& options)
 {
-    // FIXME:
     // 1. If options["mode"] does not exist, return ? AcquireReadableStreamDefaultReader(this).
-    // 2. Assert: options["mode"] is "byob".
-    // 3. Return ? AcquireReadableStreamBYOBReader(this).
+    if (!options.mode.has_value())
+        return TRY(acquire_readable_stream_default_reader(*this));
 
-    return TRY(acquire_readable_stream_default_reader(*this));
+    // 2. Assert: options["mode"] is "byob".
+    VERIFY(*options.mode == Bindings::ReadableStreamReaderMode::Byob);
+
+    // 3. Return ? AcquireReadableStreamBYOBReader(this).
+    return TRY(acquire_readable_stream_byob_reader(*this));
 }
 
 JS::ThrowCompletionOr<void> ReadableStream::initialize(JS::Realm& realm)
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStream.h b/Userland/Libraries/LibWeb/Streams/ReadableStream.h
index 5016c55cb99..425b552d6b4 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStream.h
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStream.h
@@ -9,6 +9,7 @@
 #include <AK/Forward.h>
 #include <LibJS/Forward.h>
 #include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/Bindings/ReadableStreamPrototype.h>
 #include <LibWeb/Forward.h>
 #include <LibWeb/Streams/QueuingStrategy.h>
 
@@ -20,6 +21,11 @@ using ReadableStreamReader = Variant<JS::NonnullGCPtr<ReadableStreamDefaultReade
 // https://streams.spec.whatwg.org/#typedefdef-readablestreamcontroller
 using ReadableStreamController = Variant<JS::NonnullGCPtr<ReadableStreamDefaultController>, JS::NonnullGCPtr<ReadableByteStreamController>>;
 
+// https://streams.spec.whatwg.org/#dictdef-readablestreamgetreaderoptions
+struct ReadableStreamGetReaderOptions {
+    Optional<Bindings::ReadableStreamReaderMode> mode;
+};
+
 // https://streams.spec.whatwg.org/#readablestream
 class ReadableStream final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ReadableStream, Bindings::PlatformObject);
@@ -37,7 +43,7 @@ public:
 
     bool locked() const;
     WebIDL::ExceptionOr<JS::GCPtr<JS::Object>> cancel(JS::Value reason);
-    WebIDL::ExceptionOr<ReadableStreamReader> get_reader();
+    WebIDL::ExceptionOr<ReadableStreamReader> get_reader(ReadableStreamGetReaderOptions const& = {});
 
     Optional<ReadableStreamController>& controller() { return m_controller; }
     void set_controller(Optional<ReadableStreamController> value) { m_controller = move(value); }
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStream.idl b/Userland/Libraries/LibWeb/Streams/ReadableStream.idl
index 635feaebcfe..027980c7a24 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStream.idl
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStream.idl
@@ -2,6 +2,14 @@
 #import <Streams/ReadableStreamBYOBReader.idl>
 #import <Streams/ReadableStreamDefaultReader.idl>
 
+// https://streams.spec.whatwg.org/#enumdef-readablestreamreadermode
+enum ReadableStreamReaderMode { "byob" };
+
+// https://streams.spec.whatwg.org/#dictdef-readablestreamgetreaderoptions
+dictionary ReadableStreamGetReaderOptions {
+    ReadableStreamReaderMode mode;
+};
+
 // https://streams.spec.whatwg.org/#readablestream
 [Exposed=*, Transferable]
 interface ReadableStream {
@@ -10,8 +18,7 @@ interface ReadableStream {
     readonly attribute boolean locked;
 
     Promise<undefined> cancel(optional any reason);
-    // FIXME: optional ReadableStreamGetReaderOptions options = {}
-    ReadableStreamReader getReader();
+    ReadableStreamReader getReader(optional ReadableStreamGetReaderOptions options = {});
 };
 
 typedef (ReadableStreamDefaultReader or ReadableStreamBYOBReader) ReadableStreamReader;