diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 12f356cc2..66ce73ddf 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.8.1-1"
-export PIKA_PACKAGE_NAME="r-cran-ps"
+export PIKA_PACKAGE_VERSION="1.53-2.2"
+export PIKA_PACKAGE_NAME="postmark"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"