diff --git a/serde/src/de/impls.rs b/serde/src/de/impls.rs
index 84b98f10..fa3cd214 100644
--- a/serde/src/de/impls.rs
+++ b/serde/src/de/impls.rs
@@ -27,8 +27,6 @@ use std::collections::{
     VecDeque,
 };
 
-#[cfg(feature = "collections")]
-use collections::enum_set::{CLike, EnumSet};
 #[cfg(feature = "collections")]
 use collections::borrow::ToOwned;
 
@@ -481,15 +479,6 @@ seq_impl!(
     BTreeSet::new(),
     BTreeSet::insert);
 
-#[cfg(feature = "collections")]
-seq_impl!(
-    EnumSet<T>,
-    EnumSetVisitor<T: Deserialize + CLike>,
-    visitor,
-    EnumSet::new(),
-    EnumSet::new(),
-    EnumSet::insert);
-
 #[cfg(any(feature = "std", feature = "collections"))]
 seq_impl!(
     LinkedList<T>,
diff --git a/serde/src/lib.rs b/serde/src/lib.rs
index bfcbeb3f..58cc9b8f 100644
--- a/serde/src/lib.rs
+++ b/serde/src/lib.rs
@@ -63,7 +63,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(feature = "unstable", feature(nonzero, inclusive_range, zero_one))]
 #![cfg_attr(feature = "alloc", feature(alloc))]
-#![cfg_attr(feature = "collections", feature(collections, enumset))]
+#![cfg_attr(feature = "collections", feature(collections))]
 #![cfg_attr(feature = "cargo-clippy", allow(linkedlist, type_complexity, doc_markdown))]
 #![deny(missing_docs)]
 
diff --git a/serde/src/ser/impls.rs b/serde/src/ser/impls.rs
index 6496d860..c23afdbc 100644
--- a/serde/src/ser/impls.rs
+++ b/serde/src/ser/impls.rs
@@ -24,8 +24,6 @@ use collections::{
     Vec,
 };
 
-#[cfg(feature = "collections")]
-use collections::enum_set::{CLike, EnumSet};
 #[cfg(feature = "collections")]
 use collections::borrow::ToOwned;
 
@@ -278,13 +276,6 @@ impl<T> Serialize for BTreeSet<T>
     serialize_seq!();
 }
 
-#[cfg(feature = "collections")]
-impl<T> Serialize for EnumSet<T>
-    where T: Serialize + CLike
-{
-    serialize_seq!();
-}
-
 #[cfg(feature = "std")]
 impl<T, H> Serialize for HashSet<T, H>
     where T: Serialize + Eq + Hash,