diff --git a/parsers/ChangeLog b/parsers/ChangeLog
index 4cabf6d38486fd904baca83e6c760c436bfcd189..be3076eca1297dd3a0f6915630feb66d29deffb2 100644
--- a/parsers/ChangeLog
+++ b/parsers/ChangeLog
@@ -108,7 +108,6 @@ XXXX-YY-ZZ RELEASER <admin@example.com>
       - Push Notifications (XEP-0357) (!543)
       - JSON Containers (XEP-0335) (!546)
     * Improvements:
-      - Add support for `<optional/> in XEP-0198 feature advertisment
       - Add support application-specific error conditions in XEP-0198
       - Keep unsupported vCard elements as `minidom::Element`, so that they
         get serialized back instead of being dropped.  We now also test for
diff --git a/parsers/src/sasl2.rs b/parsers/src/sasl2.rs
index 2312ca5fa7ece488b833d84b1c9d020e0599d28f..aded5f69abaeb5f5a3152de930e144c11269e61d 100644
--- a/parsers/src/sasl2.rs
+++ b/parsers/src/sasl2.rs
@@ -269,7 +269,7 @@ mod tests {
 
         let inline = auth.inline.unwrap();
         assert_eq!(inline.bind2.unwrap().inline_features.len(), 0);
-        assert_eq!(inline.sm.unwrap(), StreamManagement { optional: false });
+        assert_eq!(inline.sm.unwrap(), StreamManagement);
         assert_eq!(inline.payloads.len(), 0);
     }
 
diff --git a/parsers/src/sm.rs b/parsers/src/sm.rs
index 904bc60f19c9ad62cb218122848d6dd7aecab29d..c15ad01413f050a276261b2815cd1b4e14bd0e56 100644
--- a/parsers/src/sm.rs
+++ b/parsers/src/sm.rs
@@ -133,15 +133,10 @@ pub struct Resumed {
     pub previd: StreamId,
 }
 
-// TODO: add support for optional and required.
 /// Represents availability of Stream Management in `<stream:features/>`.
 #[derive(FromXml, AsXml, PartialEq, Debug, Clone)]
 #[xml(namespace = ns::SM, name = "sm")]
-pub struct StreamManagement {
-    /// `<optional/>` flag.
-    #[xml(flag)]
-    pub optional: bool,
-}
+pub struct StreamManagement;
 
 /// Application-specific error condition to use when the peer acknowledges
 /// more stanzas than the local side has sent.
@@ -220,7 +215,7 @@ mod tests {
         assert_size!(R, 0);
         assert_size!(Resume, 16);
         assert_size!(Resumed, 16);
-        assert_size!(StreamManagement, 1);
+        assert_size!(StreamManagement, 0);
         assert_size!(HandledCountTooHigh, 8);
     }
 
@@ -235,7 +230,7 @@ mod tests {
         assert_size!(R, 0);
         assert_size!(Resume, 32);
         assert_size!(Resumed, 32);
-        assert_size!(StreamManagement, 1);
+        assert_size!(StreamManagement, 0);
         assert_size!(HandledCountTooHigh, 8);
     }