diff --git a/stack.yaml b/stack.yaml
index 96ea6a46..f32b201f 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -13,3 +13,7 @@ packages:
   - ./yesod
   - ./yesod-eventsource
   - ./yesod-websockets
+
+# Needed for LTS 2
+extra-deps:
+- wai-app-static-3.1.3