diff --git a/serde/src/de/impls.rs b/serde/src/de/impls.rs
index 0c33ec5f..83a8f2c5 100644
--- a/serde/src/de/impls.rs
+++ b/serde/src/de/impls.rs
@@ -791,7 +791,7 @@ macro_rules! map_impl {
 #[cfg(any(feature = "std", feature = "collections"))]
 map_impl!(
     BTreeMap<K, V>,
-    BTreeMapVisitor<K: Deserialize + Eq + Ord,
+    BTreeMapVisitor<K: Deserialize + Ord,
                     V: Deserialize>,
     visitor,
     BTreeMap::new(),