diff --git a/http4s/src/main/resources/reference.conf b/http4s/src/main/resources/reference.conf
index 32db682a7..fb901a9a2 100644
--- a/http4s/src/main/resources/reference.conf
+++ b/http4s/src/main/resources/reference.conf
@@ -15,6 +15,7 @@ collector {
   cookie {
     enabled = true
     expiration = 365 days
+    domains = []
     name = sp
     secure = true
     httpOnly = true