diff --git a/src/entities/attachment.rs b/src/entities/attachment.rs
index 2115b9f..1ad9c3a 100644
--- a/src/entities/attachment.rs
+++ b/src/entities/attachment.rs
@@ -48,7 +48,7 @@ pub struct ImageDetails {
 }
 
 /// The type of media attachment.
-#[derive(Debug, Deserialize, Serialize, Clone, Copy, PartialEq)]
+#[derive(Debug, Deserialize, Serialize, Clone, Copy, PartialEq, Eq)]
 pub enum MediaType {
     /// An image.
     #[serde(rename = "image")]