diff --git a/AK/Forward.h b/AK/Forward.h
index dc73be66bd..c950a29063 100644
--- a/AK/Forward.h
+++ b/AK/Forward.h
@@ -53,7 +53,6 @@ class InputMemoryStream;
 class DuplexMemoryStream;
 class OutputStream;
 class InputBitStream;
-class OutputMemoryStream;
 
 template<size_t Capacity>
 class CircularDuplexStream;
@@ -154,7 +153,6 @@ using AK::LogStream;
 using AK::NonnullOwnPtr;
 using AK::NonnullRefPtr;
 using AK::Optional;
-using AK::OutputMemoryStream;
 using AK::OutputStream;
 using AK::OwnPtr;
 using AK::ReadonlyBytes;
diff --git a/AK/MemoryStream.h b/AK/MemoryStream.h
index 8a8bcd6196..0b1a2d311a 100644
--- a/AK/MemoryStream.h
+++ b/AK/MemoryStream.h
@@ -185,7 +185,7 @@ public:
 
     Optional<size_t> offset_of(ReadonlyBytes value) const
     {
-        if (value.size() > remaining())
+        if (value.size() > size())
             return {};
 
         // First, find which chunk we're in.
@@ -288,7 +288,7 @@ public:
 
     ByteBuffer copy_into_contiguous_buffer() const
     {
-        auto buffer = ByteBuffer::create_uninitialized(remaining());
+        auto buffer = ByteBuffer::create_uninitialized(size());
 
         const auto nread = read_without_consuming(buffer);
         ASSERT(nread == buffer.size());
@@ -299,7 +299,7 @@ public:
     size_t roffset() const { return m_read_offset; }
     size_t woffset() const { return m_write_offset; }
 
-    size_t remaining() const { return m_write_offset - m_read_offset; }
+    size_t size() const { return m_write_offset - m_read_offset; }
 
 private:
     void try_discard_chunks()
@@ -316,24 +316,8 @@ private:
     size_t m_base_offset { 0 };
 };
 
-class OutputMemoryStream final : public OutputStream {
-public:
-    size_t write(ReadonlyBytes bytes) override { return m_stream.write(bytes); }
-    bool write_or_error(ReadonlyBytes bytes) override { return m_stream.write_or_error(bytes); }
-
-    ByteBuffer copy_into_contiguous_buffer() const { return m_stream.copy_into_contiguous_buffer(); }
-
-    Optional<size_t> offset_of(ReadonlyBytes value) const { return m_stream.offset_of(value); }
-
-    size_t size() const { return m_stream.woffset(); }
-
-private:
-    DuplexMemoryStream m_stream;
-};
-
 }
 
 using AK::DuplexMemoryStream;
 using AK::InputMemoryStream;
 using AK::InputStream;
-using AK::OutputMemoryStream;
diff --git a/AK/Tests/TestMemoryStream.cpp b/AK/Tests/TestMemoryStream.cpp
index 9f17e0a27e..da419856be 100644
--- a/AK/Tests/TestMemoryStream.cpp
+++ b/AK/Tests/TestMemoryStream.cpp
@@ -129,17 +129,17 @@ TEST_CASE(duplex_large_buffer)
 
     Array<u8, 1024> one_kibibyte;
 
-    EXPECT_EQ(stream.remaining(), 0ul);
+    EXPECT_EQ(stream.size(), 0ul);
 
     for (size_t idx = 0; idx < 256; ++idx)
         stream << one_kibibyte;
 
-    EXPECT_EQ(stream.remaining(), 256 * 1024ul);
+    EXPECT_EQ(stream.size(), 256 * 1024ul);
 
     for (size_t idx = 0; idx < 128; ++idx)
         stream >> one_kibibyte;
 
-    EXPECT_EQ(stream.remaining(), 128 * 1024ul);
+    EXPECT_EQ(stream.size(), 128 * 1024ul);
 
     for (size_t idx = 0; idx < 128; ++idx)
         stream >> one_kibibyte;
@@ -164,7 +164,7 @@ TEST_CASE(write_endian_values)
 {
     const u8 expected[] { 4, 3, 2, 1, 1, 2, 3, 4 };
 
-    OutputMemoryStream stream;
+    DuplexMemoryStream stream;
     stream << LittleEndian<u32> { 0x01020304 } << BigEndian<u32> { 0x01020304 };
 
     EXPECT_EQ(stream.size(), 8u);
diff --git a/Libraries/LibCompress/Deflate.cpp b/Libraries/LibCompress/Deflate.cpp
index dcd058b69c..59f2d5c2be 100644
--- a/Libraries/LibCompress/Deflate.cpp
+++ b/Libraries/LibCompress/Deflate.cpp
@@ -307,7 +307,7 @@ Optional<ByteBuffer> DeflateDecompressor::decompress_all(ReadonlyBytes bytes)
 {
     InputMemoryStream memory_stream { bytes };
     DeflateDecompressor deflate_stream { memory_stream };
-    OutputMemoryStream output_stream;
+    DuplexMemoryStream output_stream;
 
     u8 buffer[4096];
     while (!deflate_stream.has_any_error() && !deflate_stream.unreliable_eof()) {
diff --git a/Libraries/LibCompress/Gzip.cpp b/Libraries/LibCompress/Gzip.cpp
index de19a0ff3d..cbedc5843b 100644
--- a/Libraries/LibCompress/Gzip.cpp
+++ b/Libraries/LibCompress/Gzip.cpp
@@ -164,7 +164,7 @@ Optional<ByteBuffer> GzipDecompressor::decompress_all(ReadonlyBytes bytes)
 {
     InputMemoryStream memory_stream { bytes };
     GzipDecompressor gzip_stream { memory_stream };
-    OutputMemoryStream output_stream;
+    DuplexMemoryStream output_stream;
 
     u8 buffer[4096];
     while (!gzip_stream.has_any_error() && !gzip_stream.unreliable_eof()) {
diff --git a/Shell/AST.cpp b/Shell/AST.cpp
index 7c4882b3e4..366ff1b6c7 100644
--- a/Shell/AST.cpp
+++ b/Shell/AST.cpp
@@ -1107,7 +1107,7 @@ void Execute::for_each_entry(RefPtr<Shell> shell, Function<IterationDecision(Ref
             } while (action == Continue);
 
             if (!stream.eof()) {
-                auto entry = ByteBuffer::create_uninitialized(stream.remaining());
+                auto entry = ByteBuffer::create_uninitialized(stream.size());
                 auto rc = stream.read_or_error(entry);
                 ASSERT(rc);
                 callback(create<StringValue>(String::copy(entry)));