diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 492c4478f..da92feacc 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -751,7 +751,7 @@ class PresenceHandler(BasePresenceHandler):
             new_fields["status_msg"] = msg
 
         if presence == PresenceState.ONLINE or (
-            self._busy_presence_enabled and presence == PresenceState.BUSY
+            presence == PresenceState.BUSY and self._busy_presence_enabled
         ):
             new_fields["last_active_ts"] = self.clock.time_msec()
 
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index f387d29b5..3e3d8839f 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -82,7 +82,7 @@ class VersionsRestServlet(RestServlet):
                     "io.element.e2ee_forced.private": self.e2ee_forced_private,
                     "io.element.e2ee_forced.trusted_private": self.e2ee_forced_trusted_private,
                     # Supports the busy presence state described in MSC3026.
-                    "org.matrix.msc3026.busy_presence": True,
+                    "org.matrix.msc3026.busy_presence": self.config.experimental.msc3026_enabled,
                 },
             },
         )