diff --git a/roles/custom/matrix-synapse/defaults/main.yml b/roles/custom/matrix-synapse/defaults/main.yml
index 5a5e9978..f159e01b 100644
--- a/roles/custom/matrix-synapse/defaults/main.yml
+++ b/roles/custom/matrix-synapse/defaults/main.yml
@@ -721,7 +721,7 @@ matrix_synapse_instance_map: |
         'host': 'matrix-synapse',
         'port': matrix_synapse_replication_http_port,
       },
-    }
+    } if matrix_synapse_workers_enabled else {}
   }}
 
 # Redis information