diff --git a/src/model/channel/message.rs b/src/model/channel/message.rs
index 8af29baa854..1d409530f3f 100644
--- a/src/model/channel/message.rs
+++ b/src/model/channel/message.rs
@@ -1196,6 +1196,7 @@ pub struct ChannelMention {
 /// [Discord docs](https://discord.com/developers/docs/resources/message#message-snapshot-structure)
 ///
 /// For field documentation, see [`Message`].
+#[cfg_attr(feature = "typesize", derive(typesize::derive::TypeSize))]
 #[derive(Clone, Debug, Serialize, Deserialize)]
 #[non_exhaustive]
 pub struct MessageSnapshot {