diff --git a/crates/egui/src/data/input.rs b/crates/egui/src/data/input.rs
index e8ab7383e2f..979eee49613 100644
--- a/crates/egui/src/data/input.rs
+++ b/crates/egui/src/data/input.rs
@@ -140,7 +140,7 @@ impl RawInput {
     }
 }
 
-#[derive(Clone, Debug, Default, PartialEq)]
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub struct ViewportInfo {
     pub id_pair: ViewportIdPair,