diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 9e61dd7b7..4c79db892 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.0.76-4"
-export PIKA_PACKAGE_NAME="munin"
+export PIKA_PACKAGE_VERSION="1.0.23-1"
+export PIKA_PACKAGE_NAME="rust-ref-cast"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"