diff --git a/Userland/Services/SpiceAgent/Message.cpp b/Userland/Services/SpiceAgent/Message.cpp
index 6c7da27948..8bdcf04495 100644
--- a/Userland/Services/SpiceAgent/Message.cpp
+++ b/Userland/Services/SpiceAgent/Message.cpp
@@ -275,7 +275,7 @@ ErrorOr<FileTransferDataMessage> FileTransferDataMessage::read_from_stream(AK::S
     auto contents = TRY(ByteBuffer::create_uninitialized(size));
     TRY(stream.read_until_filled(contents));
 
-    return FileTransferDataMessage(id, contents);
+    return FileTransferDataMessage(id, move(contents));
 }
 
 ErrorOr<String> FileTransferDataMessage::debug_description()
diff --git a/Userland/Services/SpiceAgent/Message.h b/Userland/Services/SpiceAgent/Message.h
index 4d2345f3e7..ed3c70fe60 100644
--- a/Userland/Services/SpiceAgent/Message.h
+++ b/Userland/Services/SpiceAgent/Message.h
@@ -172,13 +172,19 @@ private:
 // Used to send the clipboard's contents to the client/server.
 class ClipboardMessage : public Message {
 public:
-    ClipboardMessage(ClipboardDataType data_type, ByteBuffer const& contents)
+    ClipboardMessage(ClipboardDataType data_type, ByteBuffer contents)
         : Message(Type::Clipboard)
         , m_data_type(data_type)
-        , m_contents(contents)
+        , m_contents(move(contents))
     {
     }
 
+    ClipboardMessage(ClipboardMessage const&) = delete;
+    ClipboardMessage& operator=(ClipboardMessage const&) = delete;
+
+    ClipboardMessage(ClipboardMessage&&) = default;
+    ClipboardMessage& operator=(ClipboardMessage&&) = default;
+
     static ErrorOr<ClipboardMessage> read_from_stream(AK::Stream& stream);
 
     ErrorOr<void> write_to_stream(AK::Stream& stream);
@@ -247,16 +253,22 @@ class FileTransferDataMessage : public Message {
 public:
     static ErrorOr<FileTransferDataMessage> read_from_stream(AK::Stream& stream);
 
+    FileTransferDataMessage(FileTransferDataMessage const&) = delete;
+    FileTransferDataMessage& operator=(FileTransferDataMessage const&) = delete;
+
+    FileTransferDataMessage(FileTransferDataMessage&&) = default;
+    FileTransferDataMessage& operator=(FileTransferDataMessage&&) = default;
+
     ErrorOr<String> debug_description() override;
 
     u32 id() const { return m_id; }
     ByteBuffer const& contents() { return m_contents; }
 
 private:
-    FileTransferDataMessage(u32 id, ByteBuffer const& contents)
+    FileTransferDataMessage(u32 id, ByteBuffer contents)
         : Message(Type::FileTransferData)
         , m_id(id)
-        , m_contents(contents)
+        , m_contents(move(contents))
     {
     }
 
diff --git a/Userland/Services/SpiceAgent/SpiceAgent.cpp b/Userland/Services/SpiceAgent/SpiceAgent.cpp
index 04d100a455..af1bf5e498 100644
--- a/Userland/Services/SpiceAgent/SpiceAgent.cpp
+++ b/Userland/Services/SpiceAgent/SpiceAgent.cpp
@@ -91,8 +91,8 @@ ErrorOr<void> SpiceAgent::send_clipboard_contents(ClipboardDataType data_type)
         clipboard_data = TRY(Gfx::PNGWriter::encode(*bitmap));
     }
 
-    auto message = ClipboardMessage(data_type, clipboard_data);
-    TRY(this->send_message(message));
+    auto message = ClipboardMessage(data_type, move(clipboard_data));
+    TRY(this->send_message(move(message)));
 
     return {};
 }