diff --git a/build-constraints.yaml b/build-constraints.yaml
index 12c79707..f6afc5d8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4766,7 +4766,7 @@ packages:
         - nicify-lib
         - old-locale
         - old-time
-        - one-liner
+        - one-liner < 2.0 # via linear-base (ghc9)
         - operational
         - optional-args
         - options