diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 8c7cd62cd..1329d993f 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.0.9-2"
-export PIKA_PACKAGE_NAME="python-nexpy"
+export PIKA_PACKAGE_VERSION="4.2.0-1"
+export PIKA_PACKAGE_NAME="ocaml-mirage-clock"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"