diff --git a/AK/MemoryStream.h b/AK/MemoryStream.h
index 4f514169ff9..ddc4b2ab436 100644
--- a/AK/MemoryStream.h
+++ b/AK/MemoryStream.h
@@ -14,7 +14,7 @@ namespace AK {
 
 /// A stream class that allows for reading/writing on a preallocated memory area
 /// using a single read/write head.
-class FixedMemoryStream final : public SeekableStream {
+class FixedMemoryStream : public SeekableStream {
 public:
     explicit FixedMemoryStream(Bytes bytes);
     explicit FixedMemoryStream(ReadonlyBytes bytes);