diff --git a/dendrite-sample.monolith.yaml b/dendrite-sample.monolith.yaml
index ce5da2788..c0134c542 100644
--- a/dendrite-sample.monolith.yaml
+++ b/dendrite-sample.monolith.yaml
@@ -167,7 +167,7 @@ client_api:
     threshold: 5
     cooloff_ms: 500
     exempt_user_ids:
-    #  - @user:domain.com
+    #  - "@user:domain.com"
 
 # Configuration for the Federation API.
 federation_api:
diff --git a/dendrite-sample.polylith.yaml b/dendrite-sample.polylith.yaml
index 439f09b0a..b9e3e5e56 100644
--- a/dendrite-sample.polylith.yaml
+++ b/dendrite-sample.polylith.yaml
@@ -170,7 +170,7 @@ client_api:
     threshold: 5
     cooloff_ms: 500
     exempt_user_ids:
-    #  - @user:domain.com
+    #  - "@user:domain.com"
 
 # Configuration for the Federation API.
 federation_api: