diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 420524632..857471236 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="5.2.1-2"
-export PIKA_PACKAGE_NAME="rainbows"
+export PIKA_PACKAGE_VERSION="2.21.13+dfsg-1"
+export PIKA_PACKAGE_NAME="r-cran-openmx"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"