diff --git a/specification/application_service_api.rst b/specification/application_service_api.rst
index 23023a17..06a3d3b4 100644
--- a/specification/application_service_api.rst
+++ b/specification/application_service_api.rst
@@ -107,7 +107,7 @@ regular expressions and look like:
 
    users:
      - exclusive: true
-       regex: "@_irc.freenode.net_.*"
+       regex: "@_irc\.freenode\.net_.*"
 
 Application services may define the following namespaces (with none being explicitly required):