diff --git a/src/de.rs b/src/de.rs
index 8882a66c..8408e436 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::collections::{HashMap, TreeMap};
+use std::collections::{HashMap, HashSet, TreeMap, TreeSet};
 use std::gc::{GC, Gc};
 use std::hash::Hash;
 use std::num;
@@ -588,6 +588,32 @@ impl<
 
 //////////////////////////////////////////////////////////////////////////////
 
+impl<
+    T: Deserializable + Eq + Hash
+> Deserializable for HashSet<T> {
+    #[inline]
+    fn deserialize_token<
+        D: Deserializer<E>,
+        E
+    >(d: &mut D, token: Token) -> Result<HashSet<T>, E> {
+        d.expect_seq(token)
+    }
+}
+
+impl<
+    T: Deserializable + Ord
+> Deserializable for TreeSet<T> {
+    #[inline]
+    fn deserialize_token<
+        D: Deserializer<E>,
+        E
+    >(d: &mut D, token: Token) -> Result<TreeSet<T>, E> {
+        d.expect_seq(token)
+    }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
 macro_rules! peel {
     ($name:ident, $($other:ident,)*) => (impl_deserialize_tuple!($($other,)*))
 }
diff --git a/src/ser.rs b/src/ser.rs
index 8f8bd36d..779b18c7 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::collections::{HashMap, TreeMap};
+use std::collections::{HashMap, HashSet, TreeMap, TreeSet};
 use std::gc::Gc;
 use std::hash::Hash;
 use std::rc::Rc;
@@ -240,6 +240,32 @@ impl<
 
 //////////////////////////////////////////////////////////////////////////////
 
+impl<
+    T: Serializable + Eq + Hash
+> Serializable for HashSet<T> {
+    #[inline]
+    fn serialize<
+        S: Serializer<E>,
+        E
+    >(&self, s: &mut S) -> Result<(), E> {
+        s.serialize_seq(self.iter())
+    }
+}
+
+impl<
+    T: Serializable + Ord
+> Serializable for TreeSet<T> {
+    #[inline]
+    fn serialize<
+        S: Serializer<E>,
+        E
+    >(&self, s: &mut S) -> Result<(), E> {
+        s.serialize_seq(self.iter())
+    }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
 macro_rules! peel {
     ($name:ident, $($other:ident,)*) => (impl_serialize_tuple!($($other,)*))
 }