diff --git a/changelog.d/9317.doc b/changelog.d/9317.doc
new file mode 100644
index 000000000..f4d508e09
--- /dev/null
+++ b/changelog.d/9317.doc
@@ -0,0 +1 @@
+Fix the braces in the `oidc_providers` section of the sample config.
diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index 9dbba63ba..fbbf71edd 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -1872,9 +1872,9 @@ oidc_providers:
   #  user_mapping_provider:
   #    config:
   #      subject_claim: "id"
-  #      localpart_template: "{ user.login }"
-  #      display_name_template: "{ user.name }"
-  #      email_template: "{ user.email }"
+  #      localpart_template: "{{ user.login }}"
+  #      display_name_template: "{{ user.name }}"
+  #      email_template: "{{ user.email }}"
 
   # For use with Keycloak
   #
@@ -1901,8 +1901,8 @@ oidc_providers:
   #  user_mapping_provider:
   #    config:
   #      subject_claim: "id"
-  #      localpart_template: "{ user.login }"
-  #      display_name_template: "{ user.name }"
+  #      localpart_template: "{{ user.login }}"
+  #      display_name_template: "{{ user.name }}"
 
 
 # Enable Central Authentication Service (CAS) for registration and login.
diff --git a/synapse/config/oidc_config.py b/synapse/config/oidc_config.py
index 4c24c5062..9d8196d8c 100644
--- a/synapse/config/oidc_config.py
+++ b/synapse/config/oidc_config.py
@@ -198,9 +198,9 @@ class OIDCConfig(Config):
           #  user_mapping_provider:
           #    config:
           #      subject_claim: "id"
-          #      localpart_template: "{{ user.login }}"
-          #      display_name_template: "{{ user.name }}"
-          #      email_template: "{{ user.email }}"
+          #      localpart_template: "{{{{ user.login }}}}"
+          #      display_name_template: "{{{{ user.name }}}}"
+          #      email_template: "{{{{ user.email }}}}"
 
           # For use with Keycloak
           #
@@ -227,8 +227,8 @@ class OIDCConfig(Config):
           #  user_mapping_provider:
           #    config:
           #      subject_claim: "id"
-          #      localpart_template: "{{ user.login }}"
-          #      display_name_template: "{{ user.name }}"
+          #      localpart_template: "{{{{ user.login }}}}"
+          #      display_name_template: "{{{{ user.name }}}}"
         """.format(
             mapping_provider=DEFAULT_USER_MAPPING_PROVIDER
         )