diff --git a/stack-lts-18.13.yaml b/stack-lts-18.13.yaml
index 5ee274f930..62a539ae27 100644
--- a/stack-lts-18.13.yaml
+++ b/stack-lts-18.13.yaml
@@ -10,6 +10,7 @@ flags:
     debuglocks: false
     benchmark: true
     crypton: false
+    servant: true
 packages:
 - '.'
 resolver: lts-18.13