diff --git a/build-constraints.yaml b/build-constraints.yaml
index e34820c8..92c4411e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -988,8 +988,8 @@ packages:
 
     "Robert Klotzner <robert.klotzner@gmx.at> @eskimor":
         - purescript-bridge
-        - servant-purescript
-        - servant-subscriber
+        - servant-purescript < 0 # mainland-pretty <- srcloc
+        - servant-subscriber < 0 # build failure with servant 0.14: https://github.com/eskimor/servant-subscriber/issues/17
 
     "Rodrigo Setti <rodrigosetti@gmail.com> @rodrigosetti":
         - messagepack