diff --git a/changelog.d/4207.bugfix b/changelog.d/4207.bugfix
new file mode 100644
index 0000000000..c1ec9f6329
--- /dev/null
+++ b/changelog.d/4207.bugfix
@@ -0,0 +1 @@
+Remove riot.im from the list of trusted Identity Servers in the default configuration
diff --git a/docker/conf/homeserver.yaml b/docker/conf/homeserver.yaml
index 1b0f655d26..d5074be6dd 100644
--- a/docker/conf/homeserver.yaml
+++ b/docker/conf/homeserver.yaml
@@ -150,10 +150,12 @@ enable_group_creation: true
 
 # The list of identity servers trusted to verify third party
 # identifiers by this server.
+#
+# Also defines the ID server which will be called when an account is
+# deactivated (one will be picked arbitrarily).
 trusted_third_party_id_servers:
     - matrix.org
     - vector.im
-    - riot.im
 
 ## Metrics ###
 
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 7480ed5145..717bbfec61 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -93,10 +93,12 @@ class RegistrationConfig(Config):
 
         # The list of identity servers trusted to verify third party
         # identifiers by this server.
+        #
+        # Also defines the ID server which will be called when an account is
+        # deactivated (one will be picked arbitrarily).
         trusted_third_party_id_servers:
             - matrix.org
             - vector.im
-            - riot.im
 
         # Users who register on this homeserver will automatically be joined
         # to these rooms